diff --git a/B09_Estimation/B09_Estimation_Bill_Library.py b/B09_Estimation/B09_Estimation_Bill_Library.py
new file mode 100644
index 000000000..b1c1a16c6
--- /dev/null
+++ b/B09_Estimation/B09_Estimation_Bill_Library.py
@@ -0,0 +1,134 @@
+"""B09 설계내역서 연결 — 서고 구조물조합 · 일위대가 사전조합 → 프로젝트 사본(PLAN 204-2).
+
+자리 = 프로젝트 `B09_Estimation/v1/library/{폴더}/` · 폴더 = `{종류}@{층}@{주인}@{키}`
+(주인 `/` → `-` · 마스터 `-`) — 같은 것을 다시 고르면 새로 안 들여오고 있는 사본(같은 호표):
+    combo     구조물조합 = B08 구조물 사본과 한 꼴(`M02_Item_Snapshot.build_snapshot` — 집계 ·
+              도면 · 면적 · 일위대가 · 단가 · 입력값 · 고른자재 첫 값)
+    precombo  사전조합 = `일위대가.json` {줄: {담은로직: [{참조, 수량: {손: 1}}]}, 참조사본} ·
+              `단가.json`(`M02_Item_Source.price_bundle` — 사본 단가 묶음 한 벌)
+사본 = 원본이 바뀌거나 지워져도 그대로(굳힘) ·
+대가 블록 = `Labor_Source.daega_inputs`(`libs` {폴더: 블록 id}) ·
+단가 수요 = `Linked.linked_resource_keys` · 줄 연결 = {tab: dg, key: 블록 id, lib: 폴더} ·
+[저장] 때 줄이 안 쓰는 사본은 지움(`prune`) · 층 읽기 권한 = 부르는 쪽(`M02_Layer_Access.grant`).
+"""
+
+from __future__ import annotations
+
+import re
+import shutil
+from pathlib import Path
+from typing import Any
+
+from B09_Estimation.B09_Estimation_Store import folder as store_folder
+from common_util.common_util_json import atomic_write_json
+from M02_MasterTemplete import M02_Labor_Ref as refs
+from M02_MasterTemplete.M02_Item_Snapshot import MANIFEST_NAME, build_snapshot, now_text, origin_of
+from M02_MasterTemplete.M02_Item_Source import (
+    LABOR_FILE,
+    PRICE_FILE,
+    item_name,
+    labor_doc_rows,
+    price_bundle,
+    read_json,
+)
+
+LIBRARY = "library"
+KINDS = ("combo", "precombo")
+#: 폴더 이름 — 종류 · 층 · 주인 · 키(영문 · 숫자 · `-` `_`)
+NAME = re.compile(r"^(combo|precombo)@(system|company|personal)@[0-9-]+@[A-Za-z0-9_-]{1,40}$")
+
+
+def library_dir(project_root: str | Path) -> Path:
+    return store_folder(project_root) / LIBRARY
+
+
+def folder_name(kind: str, layer: str, owner: str | None, key: str) -> str:
+    """고른 서고 것 → 사본 폴더 이름 — 규칙 밖이면 ValueError."""
+    name = f"{kind}@{layer}@{(owner or '-').replace('/', '-')}@{key}"
+    if not NAME.match(name):
+        raise ValueError(f"서고 항목 모양이 틀림 「{name}」")
+    return name
+
+
+def _precombo_files(layer: str, owner: str | None, key: str) -> dict[str, Any]:
+    ref = {"층": layer, "주인": owner, "키": key}
+    doc = refs.read_ref(ref)
+    if doc is None or doc.get("종류") != refs.TITLE["precombo"]:
+        raise LookupError(f"사전조합 {key} 이 {layer} 층에 없음")
+    line = {"참조": ref, "수량": {"손": 1}}
+    labor = labor_doc_rows({"이름": doc.get("이름"), "단위": doc.get("단위"), "담은로직": [line]})
+    return {
+        LABOR_FILE: labor,
+        PRICE_FILE: price_bundle(labor, refs.folder_of(layer, owner)),
+        "_원본": {"참조": ref, "name": doc.get("이름") or key, "단위": doc.get("단위") or ""},
+    }
+
+
+def import_copy(
+    project_root: str | Path,
+    kind: str,
+    layer: str,
+    owner: str | None,
+    key: str,
+    who: dict[str, Any] | None = None,
+) -> dict[str, Any]:
+    """서고 것 하나를 프로젝트 사본으로 — `{폴더, 만듦}` · 이미 있으면 그대로(만듦 거짓) ·
+    원본이 없으면 LookupError · 모양이 틀리면 ValueError."""
+    if kind not in KINDS:
+        raise ValueError(f"서고 종류는 {', '.join(KINDS)} 중 하나")
+    name = folder_name(kind, layer, owner, key)
+    target = library_dir(project_root) / name
+    if isinstance(read_json(target / MANIFEST_NAME), dict):
+        return {"폴더": name, "만듦": False}
+    if kind == "combo":
+        item = {"layer": layer, "owner": owner, "key": key}
+        item["name"] = item_name(item)
+        files, origin = build_snapshot(item), origin_of(item)
+    else:
+        files = _precombo_files(layer, owner, key)
+        origin = files.pop("_원본")
+    if target.is_dir():  # 끊긴 쓰기(manifest 없음) 자리
+        shutil.rmtree(target)
+    target.mkdir(parents=True)
+    for file, content in files.items():
+        atomic_write_json(target / file, content)
+    stamp = now_text()
+    manifest = {"종류": kind, "원본": origin, "가져온날": stamp, "가져온이": who}
+    atomic_write_json(target / MANIFEST_NAME, manifest)  # 마지막 — 있으면 다 쓴 폴더
+    return {"폴더": name, "만듦": True}
+
+
+def copies(project_root: str | Path) -> list[tuple[Path, dict[str, Any]]]:
+    """다 쓴 사본 `(폴더, manifest)` — 폴더 이름 차례."""
+    base = library_dir(project_root)
+    out = []
+    for child in sorted(base.iterdir()) if base.is_dir() else []:
+        manifest = read_json(child / MANIFEST_NAME)
+        if child.is_dir() and NAME.match(child.name) and isinstance(manifest, dict):
+            out.append((child, manifest))
+    return out
+
+
+def used_folders(user: dict[str, Any]) -> set[str]:
+    """설계내역서 덮개 줄이 잇는 서고 사본 폴더."""
+    rows = ((user or {}).get("bill") or {}).get("rows") or []
+    return {
+        str(ref["lib"])
+        for row in rows
+        if isinstance(row, dict)
+        and isinstance(ref := row.get("ref"), dict)
+        and ref.get("tab") == "dg"
+        and ref.get("lib")
+    }
+
+
+def prune(project_root: str | Path, user: dict[str, Any]) -> list[str]:
+    """[저장] 뒤 — 줄이 안 잇는 사본 폴더를 지움(다시 고르면 새로 들여옴) · 지운 이름."""
+    keep = used_folders(user)
+    base = library_dir(project_root)
+    gone = []
+    for child in sorted(base.iterdir()) if base.is_dir() else []:
+        if child.is_dir() and NAME.match(child.name) and child.name not in keep:
+            shutil.rmtree(child)
+            gone.append(child.name)
+    return gone
diff --git a/B09_Estimation/B09_Estimation_Labor_Source.py b/B09_Estimation/B09_Estimation_Labor_Source.py
index cb49e0f09..578f7dc74 100644
--- a/B09_Estimation/B09_Estimation_Labor_Source.py
+++ b/B09_Estimation/B09_Estimation_Labor_Source.py
@@ -26,6 +26,7 @@ from decimal import Decimal
 from pathlib import Path
 from typing import Any
 
+from B09_Estimation import B09_Estimation_Bill_Library as library
 from B09_Estimation import B09_Estimation_Sangeun as sg
 from B09_Estimation import B09_Estimation_Sangeun_Text as st
 from M02_MasterTemplete import M02_Item_Prices as item_prices
@@ -282,6 +283,19 @@ class Builder:
             }
         )
 
+    def library(self, folder: Path, manifest: dict[str, Any]) -> str | None:
+        """설계내역서 서고 사본(204-2) — 구조물조합 = 조합 블록 · 사전조합 = 겹 대가 블록 그대로."""
+        if manifest.get("종류") != "precombo":
+            return self.combo(folder)
+        labor = read_json(folder / LABOR_FILE)
+        ref = (manifest.get("원본") or {}).get("참조")
+        copies = (labor or {}).get("참조사본") or {}
+        doc = copies.get(refs.ref_id(ref)) if isinstance(ref, dict) else None
+        if not isinstance(doc, dict):
+            return None
+        whole = item_prices.load_prices(read_json(folder / PRICE_FILE) or {})
+        return self.precombo(whole, ref, doc, copies, 1)
+
 
 def _material(whole: Any, mat: dict, qty: Any) -> dict[str, Any]:
     """자재 줄 — 조합 사용자 자재 · 사전조합 자재(175-2) 한 꼴 · 이름 · 규격 · 단위 = 사본 단가."""
@@ -327,9 +341,11 @@ def _plain(value: Any) -> Any:
 
 
 def daega_inputs(project_root: str | Path) -> dict[str, Any]:
-    """대가 셈 입력 — `{blocks: [...], owners: {구조물 id: 블록 id}}` · 사본 없으면 빈 것.
+    """대가 셈 입력 — `{blocks: [...], owners: {구조물 id: 블록 id}}` · 사본 없으면 빈 것 ·
+    설계내역서 서고 사본(204-2)이 있으면 `libs` {폴더: 블록 id}.
 
-    차례 = 조합(구조물 id 차례) → 사전조합 → 일위대가화(품셈 · 처음 본 차례) — 호표 번호 = 이 차례.
+    차례 = 조합(구조물 id 차례 → 서고 사본) → 사전조합 → 일위대가화(품셈 · 처음 본 차례) —
+    호표 번호 = 이 차례.
     """
     base = structures_dir(project_root)
     build = Builder()
@@ -343,6 +359,15 @@ def daega_inputs(project_root: str | Path) -> dict[str, Any]:
             bid = None  # 한 사본이 막혀도 나머지 블록은 셈 — 그 구조물은 없음
         if bid:
             owners[owner] = bid
+    libs: dict[str, str] = {}
+    for folder, manifest in library.copies(project_root):
+        try:
+            bid = build.library(folder, manifest)
+        except (mf.FormulaError, ArithmeticError, KeyError, TypeError, ValueError):
+            bid = None
+        if bid:
+            libs[folder.name] = bid
     order = {"조합": 0, "사전조합": 1, "품셈": 2}
     blocks = sorted(build.blocks.values(), key=lambda b: order[b["kind"]])
-    return _plain({"blocks": blocks, "owners": owners})
+    out = {"blocks": blocks, "owners": owners}
+    return _plain({**out, "libs": libs} if libs else out)
diff --git a/B09_Estimation/B09_Estimation_Linked.py b/B09_Estimation/B09_Estimation_Linked.py
index ff2427dd3..868e8e7e3 100644
--- a/B09_Estimation/B09_Estimation_Linked.py
+++ b/B09_Estimation/B09_Estimation_Linked.py
@@ -67,13 +67,19 @@ def used_keys(folder: Path) -> list[str]:
 
 
 def linked_resource_keys(project_root: str | Path) -> list[str]:
-    """연결된 사본 전부가 부른 자원 키 — 구조물 id 차례 · 겹침 없음."""
+    """연결된 사본 전부가 부른 자원 키 — 구조물 id 차례 → 설계내역서 서고 사본(204-2) ·
+    겹침 없음."""
+    from B09_Estimation.B09_Estimation_Bill_Library import copies
+
     base = structures_dir(project_root)
+    folders = [
+        base / linked["폴더"]
+        for _owner, linked in sorted(linked_snapshots(project_root).items())
+        if "일위대가" in linked.get("부분", [])
+    ]
     out: list[str] = []
-    for _owner, linked in sorted(linked_snapshots(project_root).items()):
-        if "일위대가" not in linked.get("부분", []):
-            continue
-        for key in used_keys(base / linked["폴더"]):
+    for folder in [*folders, *(f for f, _ in copies(project_root))]:
+        for key in used_keys(folder):
             if key not in out:
                 out.append(key)
     return out
diff --git a/B09_Estimation/B09_Estimation_Router.py b/B09_Estimation/B09_Estimation_Router.py
index 0c36b0627..62ccb65e8 100644
--- a/B09_Estimation/B09_Estimation_Router.py
+++ b/B09_Estimation/B09_Estimation_Router.py
@@ -6,6 +6,10 @@
         [저장] — 사용자 값 · 책에 없는 새 단가 줄만 굳힘 → 서버가 정본으로 다시 셈
     POST /api/projects/{id}/estimation/prices
         [단가 갱신] — 수요 단가 전부를 지금 M01 값으로 새로 굳힘
+    POST /api/projects/{id}/estimation/library   {kind, layer, owner, key}
+        설계내역서 연결 고르기(204-2) — 서고 구조물조합 · 사전조합을 프로젝트 사본으로
+        (있으면 그대로) → {폴더, 만듦, key = 대가 블록 id, payload} ·
+        층 읽기 권한 = `M02_Layer_Access` · 줄 연결은 화면 캐시 → [저장] 때 안 쓰는 사본 지움(`Bill_Library.prune`)
 
 저장 자리 = 프로젝트 안 `B09_Estimation/v1/`(`B09_Estimation_Store`) ·
 단가 = `B09_Estimation_Prices` ·
@@ -20,11 +24,13 @@ from pathlib import Path
 from typing import Any
 from uuid import UUID
 
-from fastapi import APIRouter, Body
+from fastapi import APIRouter, Body, Depends, HTTPException
+from pydantic import BaseModel
 
 from B08_Quantity.B08_Quantity_Router_Earthwork import earthwork_table
 from B08_Quantity.B08_Quantity_Router_Hydro import _project_root
 from B08_Quantity.B08_Quantity_Router_Material import material_sheets
+from B09_Estimation import B09_Estimation_Bill_Library as library
 from B09_Estimation import B09_Estimation_Prices as prices
 from B09_Estimation import B09_Estimation_Sangeun as sangeun
 from B09_Estimation import B09_Estimation_Store as store
@@ -38,6 +44,9 @@ from B09_Estimation.B09_Estimation_Linked import linked_resource_keys
 from B09_Estimation.B09_Estimation_Rates import rate_candidates, rate_table
 from B09_Estimation.B09_Estimation_Router_Quotes import router as quotes_router
 from B09_Estimation.B09_Estimation_Summary import compute_summary, hopyo_lines, used_materials
+from common_util.common_util_auth import verify_session
+from M02_MasterTemplete import M02_Layer_Access as access
+from M02_MasterTemplete.M02_Item_Snapshot import importer
 
 router = APIRouter(prefix="/api/projects", tags=["B09 Estimation"])
 
@@ -141,7 +150,8 @@ async def estimation(project_id: UUID) -> dict[str, Any]:
 @router.put("/{project_id}/estimation")
 async def save_estimation(project_id: UUID, body: dict[str, Any] = Body(...)) -> dict[str, Any]:
     root = await _project_root(project_id)
-    await asyncio.to_thread(store.write_user, root, body.get("user"))
+    user = await asyncio.to_thread(store.write_user, root, body.get("user"))
+    await asyncio.to_thread(library.prune, root, user)  # 204-2 줄이 안 잇는 서고 사본
     keys = await _demand(root)
     book = await asyncio.to_thread(store.read_book, root)
     book = await asyncio.to_thread(prices.extend_book, book, keys)
@@ -158,5 +168,31 @@ async def refresh_prices(project_id: UUID) -> dict[str, Any]:
     return await payload(project_id, root)
 
 
+class LibraryBody(BaseModel):
+    kind: str
+    layer: str
+    owner: str | None = None
+    key: str
+
+
+@router.post("/{project_id}/estimation/library")
+async def import_library(
+    project_id: UUID, body: LibraryBody, session: dict[str, Any] = Depends(verify_session)
+) -> dict[str, Any]:
+    got = access.grant(session, body.layer, body.owner)  # 못 읽는 층 = 403 · 회사 없음 = 409
+    root = await _project_root(project_id)
+    try:
+        made = await asyncio.to_thread(
+            library.import_copy, root, body.kind, got.layer, got.owner, body.key, importer(session)
+        )
+    except LookupError as error:
+        raise HTTPException(status_code=404, detail=str(error)) from error
+    except ValueError as error:
+        raise HTTPException(status_code=400, detail=str(error)) from error
+    out = await payload(project_id, root)
+    key = ((out["inputs"].get("daega") or {}).get("libs") or {}).get(made["폴더"])
+    return {**made, "key": key, "payload": out}
+
+
 # 166-4 견적서 파일 길 — 같은 머리 · 같은 권한
 router.include_router(quotes_router)
diff --git a/B09_Estimation/B09_Estimation_Store.py b/B09_Estimation/B09_Estimation_Store.py
index da7557fbd..0f1c5862a 100644
--- a/B09_Estimation/B09_Estimation_Store.py
+++ b/B09_Estimation/B09_Estimation_Store.py
@@ -95,12 +95,14 @@ def _text(value: Any) -> str:
 
 
 def _clean_ref(ref: Any) -> dict[str, Any] | None:
-    """손 줄 연결 — dg · sg = 호표 키 · logic = M01 로직(입력값 · 켜쌓기율 · 고름)."""
+    """손 줄 연결 — dg · sg = 호표 키 · logic = M01 로직(입력값 · 켜쌓기율 · 고름) ·
+    dg `lib` = 서고 사본 폴더(204-2 · [저장] 때 안 쓰는 사본 지움)."""
     if not isinstance(ref, dict):
         return None
     tab = ref.get("tab")
     if tab in ("dg", "sg") and isinstance(ref.get("key"), str) and ref["key"]:
-        return {"tab": tab, "key": ref["key"]}
+        lib = ref.get("lib") if tab == "dg" else None
+        return {"tab": tab, "key": ref["key"], **({"lib": lib} if isinstance(lib, str) else {})}
     if tab == "logic" and isinstance(ref.get("code"), str) and ref["code"]:
         given = ref.get("given") if isinstance(ref.get("given"), dict) else {}
         picks = ref.get("picks") if isinstance(ref.get("picks"), dict) else None
diff --git a/B09_Estimation/B09_Estimation_UI_Tabs_Bill_Link.ts b/B09_Estimation/B09_Estimation_UI_Tabs_Bill_Link.ts
index 4bd17684e..0e384d428 100644
--- a/B09_Estimation/B09_Estimation_UI_Tabs_Bill_Link.ts
+++ b/B09_Estimation/B09_Estimation_UI_Tabs_Bill_Link.ts
@@ -1,14 +1,19 @@
 /* =============================================================================
  * B09_Estimation_UI_Tabs_Bill_Link.ts
  * B09 설계내역서 연결 고르기(166-2 · 184-3) — 있는 호표(일위대가목록표 dg · 단가산출근거목록표 sg) ·
- *   M01 로직(새 산근 = 서버 셈 · [저장] 뒤 단가) · 로직 입력값 고치기 · 연결 풀기.
+ *   서고(마스터 · 회사 · 개인) 구조물조합 · 일위대가 사전조합(204-2 — 서버가 프로젝트 사본으로 들여와 새
+ *   대가 호표 · 같은 것 = 있는 사본) · M01 로직(새 산근 = 서버 셈 · [저장] 뒤 단가) · 로직 입력값 고치기 ·
+ *   연결 풀기.
  *
  *   줄에 적는 일 = 부르는 쪽 `apply(ref, from)`(`…_UI_Tabs_Bill_Edit` · 저장 꼴 모름)
- *   로직 고르기 · 입력값 = M02 창 재사용
+ *   로직 · 사전조합 고르기 · 입력값 = M02 창 재사용 · 구조물조합 고르기 = B08 [선택] 나무(173) 재사용 ·
+ *   층 읽기 권한 = 서버(`M02_Layer_Access`)
  * ========================================================================== */
 
+import { API_BASE_URL, CURRENT_PROJECT_ID_KEY } from "@config/config_frontend";
 import { showToast } from "@ui/ui_template_elements";
 import { createFindList } from "@ui/ui_template_find_list";
+import { openItemPicker } from "@ui/ui_template_item_picker";
 import { openModal } from "@ui/ui_template_modal";
 import { fetchLogicInputs } from "../M02_MasterTemplete/M02_MasterTemplete_Labor_Api";
 import { openLaborInput } from "../M02_MasterTemplete/M02_MasterTemplete_Labor_Input";
@@ -86,6 +91,63 @@ function askInputs(apply: ApplyRef, code: string, name: string, old?: Row): void
   );
 }
 
+/** 서고 것 → 프로젝트 사본 · 새 대가 호표(204-2) — 서버가 들여옴 → 받은 원가 자료(대가 블록 · 산근)만
+ * 바꿔 끼우고(사용자 캐시 그대로) 줄 연결 `{tab: dg, key: 블록 id, lib: 사본 폴더}` */
+async function importLib(
+  ctx: TabContext,
+  apply: ApplyRef,
+  pick: { kind: "combo" | "precombo"; layer: string; owner: string | null; key: string },
+): Promise<void> {
+  const projectId = localStorage.getItem(CURRENT_PROJECT_ID_KEY);
+  if (!projectId) return;
+  showToast("서고에서 들여오는 중…", "info");
+  try {
+    const response = await fetch(`${API_BASE_URL}/projects/${projectId}/estimation/library`, {
+      method: "POST",
+      credentials: "include",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(pick),
+    });
+    const got = (await response.json().catch(() => null)) as Row | null;
+    if (!response.ok || !got) {
+      const detail = got?.detail;
+      throw new Error(typeof detail === "string" ? detail : `HTTP ${response.status}`);
+    }
+    if (!got.key) throw new Error("사본은 들여왔으나 호표를 못 만듦");
+    const { user: _user, ...rest } = got.payload as Row;
+    Object.assign(ctx.payload, rest);
+    const from = ((rest.sheets?.daega as Row[]) || []).find((r) => r.key === got.key);
+    apply({ tab: "dg", key: got.key, lib: got.폴더 }, from);
+    showToast(
+      got.만듦 ? "새 호표로 연결함 — [저장]해야 연결이 남음" : "들여온 사본 호표로 연결함",
+      "success",
+    );
+  } catch (error) {
+    showToast(`서고에서 못 들여옴 — ${error instanceof Error ? error.message : error}`, "error");
+  }
+}
+
+/** 서고 구조물조합 — B08 [선택] 나무(마스터 · 회사 · 개인 · 보기만) */
+function pickCombo(ctx: TabContext, apply: ApplyRef): void {
+  void openItemPicker({ current: null, canCopy: false }).then((got) => {
+    if (got.action !== "apply") return;
+    const { layer, owner, key } = got.item;
+    void importLib(ctx, apply, { kind: "combo", layer, owner, key });
+  });
+}
+
+/** 서고 일위대가 사전조합 — M02 고르기 창 서고 줄만(층 단추 마스터 · 회사 · 개인) */
+function pickPrecombo(ctx: TabContext, apply: ApplyRef): void {
+  openLogicPicker(() => undefined, {
+    layer: "personal",
+    owner: null,
+    libOnly: true,
+    title: "일위대가 사전조합 고르기",
+    pick: (ref) =>
+      void importLib(ctx, apply, { kind: "precombo", layer: ref.층, owner: ref.주인, key: ref.키 }),
+  });
+}
+
 /** 항목 줄 연결 메뉴 — [고르기 셋, 그 밖(로직 입력값 · 연결 풀기)] · ref = 지금 연결 */
 export function linkItems(ctx: TabContext, ref: Row | null, apply: ApplyRef): [Leaf[], Leaf[]] {
   const more: Leaf[] = [];
@@ -95,6 +157,8 @@ export function linkItems(ctx: TabContext, ref: Row | null, apply: ApplyRef): [L
   const picks: Leaf[] = [
     ["일위대가 호표", () => pickHopyo(ctx, apply, "dg")],
     ["단가산출 호표", () => pickHopyo(ctx, apply, "sg")],
+    ["서고 구조물조합(마스터 · 회사 · 개인)", () => pickCombo(ctx, apply)],
+    ["서고 일위대가 사전조합(마스터 · 회사 · 개인)", () => pickPrecombo(ctx, apply)],
     [
       "단가산출 로직(M01 · 새 산근)",
       () => openLogicPicker((logic) => askInputs(apply, logic.키, logic.이름)),
diff --git a/M02_MasterTemplete/M02_Item_Source.py b/M02_MasterTemplete/M02_Item_Source.py
index 717791ba8..597cb086c 100644
--- a/M02_MasterTemplete/M02_Item_Source.py
+++ b/M02_MasterTemplete/M02_Item_Source.py
@@ -132,8 +132,6 @@ def logic_rows(row: dict[str, Any]) -> dict[str, Any]:
 
 def build_source(item: dict[str, Any]) -> dict[str, Any]:
     """원본 층 · 마스터에서 항목 내용을 모음 — SS 줄이 없으면 LookupError."""
-    from M02_MasterTemplete import M02_Item_Prices as prices
-
     root = layer_root(item)
     row = row_of(read_json(root / layers.COMBO_FILE), item["key"])
     if row is None:
@@ -153,6 +151,14 @@ def build_source(item: dict[str, Any]) -> dict[str, Any]:
         labor = labor_rows(str(row["일위대가"])) if row.get("일위대가") else None
     if labor is not None:
         files[LABOR_FILE] = labor
+    files[PRICE_FILE] = price_bundle(labor, root)
+    return files
+
+
+def price_bundle(labor: dict[str, Any] | None, root: Path) -> dict[str, Any]:
+    """사본 단가 묶음(`단가.json`) — 담은 로직 · 굳힌 참조 로직 · 자재 · 고른 자재 · 사전조합 자재 ·
+    개인 자재(`root` = 원본 층 · B09 설계내역서 서고 사본도 이 길 · 204-2)."""
+    from M02_MasterTemplete import M02_Item_Prices as prices
     from M02_MasterTemplete import M02_Labor_Ref as refs
 
     logic_keys = [str(one.get("키")) for one in (labor or {}).get("로직", [])]
@@ -164,9 +170,9 @@ def build_source(item: dict[str, Any]) -> dict[str, Any]:
     ]
     materials += refs.frozen_materials((labor or {}).get("참조사본") or {})  # 175-2 사전조합 자재
     wanted = logic_keys + [code for code in materials if code]
-    files[PRICE_FILE] = prices.to_json(prices.collect(logic_keys, materials)) if wanted else {}
+    bundle = prices.to_json(prices.collect(logic_keys, materials)) if wanted else {}
     if mine := own.bundle(
         [c for c in materials if own.is_own(c)], root
     ):  # 개인 자재(148-3 · 사전조합 것도 175-2) — 원본 목록이 바뀌어도 사본 그대로
-        files[PRICE_FILE][own.BUNDLE] = mine
-    return files
+        bundle[own.BUNDLE] = mine
+    return bundle
diff --git a/M02_MasterTemplete/M02_MasterTemplete_Labor_Pick.ts b/M02_MasterTemplete/M02_MasterTemplete_Labor_Pick.ts
index 7dafc26ec..a7cc104cf 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_Labor_Pick.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_Labor_Pick.ts
@@ -34,6 +34,9 @@ export interface LibraryPick {
   layer: Layer;
   owner: string | null;
   pick: (ref: LaborRef, name: string) => void;
+  /** 서고 줄만(로직 목록 안 받음 · B09 설계내역서 연결 204-2) · 창 제목 */
+  libOnly?: boolean;
+  title?: string;
 }
 
 /** 고를 수 있는 층 — 위 층만(마스터 → 마스터 · 회사 → 그 회사 · 마스터 · 개인 → 그 개인 · 그 회사 · 마스터) */
@@ -213,7 +216,7 @@ export function openLogicPicker(done: (logic: LogicSummary) => void, lib?: Libra
       el("div", {
         className: "m01-logic__section-head",
         children: [
-          el("h3", { text: tc("Pick_Title") }),
+          el("h3", { text: lib?.title ?? tc("Pick_Title") }),
           createButton({ label: tc("Pick_Close"), variant: "ghost", onClick: close }),
         ],
       }),
@@ -226,14 +229,15 @@ export function openLogicPicker(done: (logic: LogicSummary) => void, lib?: Libra
   document.body.append(backdrop);
   finder.search.focus();
 
-  void Promise.all([fetchLogicSubs(), fetchLogics()])
-    .then(([s, l]) => {
-      subs.push(...s);
-      all = l;
-      drawSubs();
-      find();
-    })
-    .catch((error) =>
-      showToast(error instanceof Error ? error.message : tc("Load_Failed"), "error"),
-    );
+  if (!lib?.libOnly)
+    void Promise.all([fetchLogicSubs(), fetchLogics()])
+      .then(([s, l]) => {
+        subs.push(...s);
+        all = l;
+        drawSubs();
+        find();
+      })
+      .catch((error) =>
+        showToast(error instanceof Error ? error.message : tc("Load_Failed"), "error"),
+      );
 }
diff --git a/resources/tester/test_182_b09_bill_level.py b/resources/tester/test_182_b09_bill_level.py
index 8b938d94d..cccc9ecf4 100644
--- a/resources/tester/test_182_b09_bill_level.py
+++ b/resources/tester/test_182_b09_bill_level.py
@@ -317,7 +317,13 @@ def test_연결_단추_칸_메뉴_고르기_창_TS():
     ]  # fmt: skip  201-1 레벨 = 공용 표 level
     assert out["lv"] == ["name", 1, 3, 4, 3]
     assert out["edit"] == [True, False]  # 묶음 줄 = 이름만
-    picks = ["일위대가 호표", "단가산출 호표", "단가산출 로직(M01 · 새 산근)"]
+    picks = [
+        "일위대가 호표",
+        "단가산출 호표",
+        "서고 구조물조합(마스터 · 회사 · 개인)",
+        "서고 일위대가 사전조합(마스터 · 회사 · 개인)",
+        "단가산출 로직(M01 · 새 산근)",
+    ]  # 204-2
     # 누른 칸 아래(left · bottom) · 묶음 줄 = 안 엶 · 연결된 줄(자동 줄도) = 연결 풀기 더함
     unlink = [10, 40, [*picks, "-", "연결 풀기"]]
     assert out["menus"] == [unlink, unlink, [10, 40, picks]]
diff --git a/resources/tester/test_204_2_b09_bill_library.py b/resources/tester/test_204_2_b09_bill_library.py
new file mode 100644
index 000000000..c89d23564
--- /dev/null
+++ b/resources/tester/test_204_2_b09_bill_library.py
@@ -0,0 +1,244 @@
+"""204-2 B09 설계내역서 연결 고르기 — 프로젝트 호표 + 서고(마스터 · 회사 · 개인)
+구조물조합 · 사전조합.
+
+- 서고 고름 = 프로젝트 사본 들여옴(`B09_Estimation/v1/library/{폴더}`) + 새 대가 호표(`libs`) +
+  줄 연결 `{tab: dg, key: 블록 id, lib: 폴더}` · 다시 고르면 같은 사본(만듦 거짓 · 같은 호표)
+- 사본 단가 묶음(로직 · 사전조합 자재 · 고른 자재) · 원본을 지워도 그대로 · 단가 수요 키에 듦
+- [저장] = 줄이 안 잇는 사본 지움 · 덮개 저장 꼴이 `lib` 를 지킴
+- 층 권한 = `M02_Layer_Access`(남의 회사 403 · 회사 없는 개인 409)
+- 화면 — 연결 메뉴 출처 다섯 · 사전조합 창(서고 줄만) → 들여오기 → 원가 자료 바꿔 끼움 · 줄 연결
+임시 층(견본 마스터 · 임시 storage) · 실제 마스터 · 프로젝트는 안 씀.
+"""
+
+import asyncio
+import json
+import re
+import subprocess
+import sys
+from pathlib import Path
+
+import pytest
+from fastapi import HTTPException
+
+ROOT = Path(__file__).resolve().parents[2]
+if str(ROOT) not in sys.path:
+    sys.path.insert(0, str(ROOT))
+
+from B09_Estimation import B09_Estimation_Bill_Library as library  # noqa: E402
+from B09_Estimation import B09_Estimation_Router as router  # noqa: E402
+from B09_Estimation import B09_Estimation_Store as store_b09  # noqa: E402
+from B09_Estimation.B09_Estimation_Labor_Source import daega_inputs  # noqa: E402
+from B09_Estimation.B09_Estimation_Linked import linked_resource_keys  # noqa: E402
+from config import config_system  # noqa: E402
+from M02_MasterTemplete import M02_Labor_Ref as refs  # noqa: E402
+from M02_MasterTemplete import M02_MasterTemplete_Store as store  # noqa: E402
+from M02_MasterTemplete import M02_Template_Layers as layers  # noqa: E402
+from resources.tester.helper_m02_master_sample import copy_master_sample  # noqa: E402
+
+STONE = "GF000219"  # 돌쌓기 메쌓기 원/㎡
+NET = "GC000337"  # 낙석방지망 — 고름 4 = NET_ITEM
+NET_ITEM = "MT006697"
+MAT = "MT000008"
+COMBO = "SS000011"  # 견본 관공 관매설(옛 UA 조합 줄)
+IMPORTS = re.compile(r"^import[^;]*;\r?\n", re.MULTILINE)
+
+
+@pytest.fixture()
+def world(tmp_path, monkeypatch):
+    system = copy_master_sample(tmp_path / "master")
+    monkeypatch.setattr(store, "FOLDER", system)
+    monkeypatch.setattr(layers, "SYSTEM_ROOT", system)
+    monkeypatch.setattr(config_system, "STORAGE_BASE_DIR", str(tmp_path / "storage"))
+    lines = [
+        {"로직": STONE, "수량": {"손": 2}},
+        {"로직": NET, "수량": {"손": 1}, "고름": {"4": NET_ITEM}},
+    ]
+    with store.at(system):
+        key = refs.create(
+            "precombo",
+            {"이름": "서고 조합", "단위": "㎡", "담은로직": lines,
+             "자재": [{"코드": MAT, "수량": {"손": 3}}]},
+        )["이름"]  # fmt: skip
+    company = layers.company_dir(7)
+    company.mkdir(parents=True)
+    with store.at(company):
+        other = refs.create("precombo", {"이름": "회사 조합", "담은로직": lines[:1]})["이름"]
+    project = tmp_path / "storage" / "7" / "1" / "proj"
+    project.mkdir(parents=True)
+    return {"system": system, "key": key, "company": other, "root": project}
+
+
+def _block(root, folder):
+    got = daega_inputs(root)
+    bid = got["libs"][folder]
+    return got, next(b for b in got["blocks"] if b["id"] == bid)
+
+
+def test_사전조합_고름_사본_들여옴_새_호표_다시_고르면_재사용(world):
+    root = world["root"]
+    made = library.import_copy(root, "precombo", "system", None, world["key"])
+    folder = made["폴더"]
+    assert made == {"폴더": f"precombo@system@-@{world['key']}", "만듦": True}
+    copy = library.library_dir(root) / folder
+    assert {p.name for p in copy.iterdir()} == {"일위대가.json", "단가.json", "manifest.json"}
+    got, block = _block(root, folder)
+    assert (block["kind"], block["name"], block["unit"]) == ("사전조합", "서고 조합", "㎡")
+    kinds = [(ln["kind"], ln.get("qty")) for ln in block["lines"]]
+    assert kinds == [("sangeun", 2.0), ("sangeun", 1.0), ("material", 3.0)]
+    assert got["owners"] == {}  # 구조물 사본 없어도 호표
+    # 단가 묶음 = 담은 로직 · 사전조합 자재 · 고른 자재(사본 셈이 마스터를 안 읽음)
+    bundle = json.loads((copy / "단가.json").read_text("utf-8"))
+    text = json.dumps(bundle, ensure_ascii=False)
+    assert all(code in text for code in (STONE, NET, MAT, NET_ITEM))
+    keys = linked_resource_keys(root)
+    assert MAT in keys and any(k.startswith("LB") for k in keys)  # 단가 수요에 듦
+    # 다시 고름 = 새로 안 들여옴 · 같은 호표
+    again = library.import_copy(root, "precombo", "system", None, world["key"])
+    assert again == {"폴더": folder, "만듦": False}
+    assert _block(root, folder)[1]["id"] == block["id"]
+    # 원본을 지워도 굳힌 사본 그대로
+    (world["system"] / "precombo" / f"{world['key']}.json").unlink()
+    assert _block(root, folder)[1]["id"] == block["id"]
+
+
+def test_구조물조합_고름_사본_조합_호표(world):
+    root = world["root"]
+    made = library.import_copy(root, "combo", "system", None, COMBO)
+    copy = library.library_dir(root) / made["폴더"]
+    names = {p.name for p in copy.iterdir()}
+    assert {"집계.json", "일위대가.json", "단가.json", "입력값.json", "manifest.json"} <= names
+    manifest = json.loads((copy / "manifest.json").read_text("utf-8"))
+    assert manifest["종류"] == "combo" and manifest["원본"]["key"] == COMBO
+    assert manifest["원본"]["경로"]  # 가져온 때 경로
+    _, block = _block(root, made["폴더"])
+    assert block["kind"] == "조합" and block["lines"]
+    assert block["origin"] == {"layer": "system", "owner": None, "key": COMBO}
+
+
+def test_없는_것_모양_틀림(world):
+    root = world["root"]
+    with pytest.raises(LookupError):
+        library.import_copy(root, "precombo", "system", None, "SC-999999")
+    with pytest.raises(LookupError):
+        library.import_copy(root, "combo", "system", None, "SS999999")
+    with pytest.raises(ValueError):
+        library.import_copy(root, "precombo", "system", None, "../x")
+    with pytest.raises(ValueError):
+        library.import_copy(root, "other", "system", None, world["key"])
+    assert library.copies(root) == []
+
+
+def test_저장_때_안_잇는_사본_지움_lib_지킴(world):
+    root = world["root"]
+    a = library.import_copy(root, "precombo", "system", None, world["key"])["폴더"]
+    b = library.import_copy(root, "combo", "system", None, COMBO)["폴더"]
+    ref = {"tab": "dg", "key": "DG:x", "lib": a}
+    user = store_b09.clean_user(
+        {"bill": {"v": 2, "rows": [{"key": "hand:1", "name": "줄", "qty": 1, "ref": ref}]}}
+    )
+    assert user["bill"]["rows"][0]["ref"] == ref  # 저장 꼴이 lib 를 지킴
+    assert library.prune(root, user) == [b]
+    assert [f.name for f, _ in library.copies(root)] == [a]
+    assert library.prune(root, {}) == [a] and library.copies(root) == []
+
+
+def _call(monkeypatch, root, session, **body):
+    async def fake_root(_):
+        return root
+
+    async def fake_payload(_, at):
+        return {"inputs": {"daega": daega_inputs(at)}, "sheets": {}}
+
+    monkeypatch.setattr(router, "_project_root", fake_root)
+    monkeypatch.setattr(router, "payload", fake_payload)
+    req = router.LibraryBody(**body)
+    return asyncio.run(router.import_library("00000000-0000-0000-0000-000000000001", req, session))
+
+
+def test_층_권한_길(world, monkeypatch):
+    root = world["root"]
+    mine = {"user_id": 1, "company_id": 7, "role": "USER", "name": "갑"}
+    got = _call(monkeypatch, root, mine, kind="precombo", layer="company", key=world["company"])
+    assert got["만듦"] and got["폴더"] == f"precombo@company@7@{world['company']}"
+    assert got["key"] == got["payload"]["inputs"]["daega"]["libs"][got["폴더"]]
+    assert json.loads((library.library_dir(root) / got["폴더"] / "manifest.json").read_bytes())[
+        "가져온이"
+    ] == {"id": 1, "이름": "갑"}
+    other = {"user_id": 2, "company_id": 8, "role": "USER"}
+    with pytest.raises(HTTPException) as error:
+        _call(monkeypatch, root, other, kind="precombo", layer="company", owner="7",
+              key=world["company"])  # fmt: skip
+    assert error.value.status_code == 403
+    lonely = {"user_id": 3, "company_id": None, "role": "USER"}
+    with pytest.raises(HTTPException) as error:
+        _call(monkeypatch, root, lonely, kind="precombo", layer="personal", key=world["key"])
+    assert error.value.status_code == 409
+    with pytest.raises(HTTPException) as error:
+        _call(monkeypatch, root, lonely, kind="precombo", layer="system", key="SC-999999")
+    assert error.value.status_code == 404
+    got = _call(monkeypatch, root, lonely, kind="precombo", layer="system", key=world["key"])
+    assert got["만듦"] and got["key"]  # 마스터 = 누구나 읽음
+
+
+# ── 화면 ──────────────────────────────────────────────────────────────
+LINK_JS = """
+const toasts = [];
+const sent = [];
+globalThis.showToast = (m, k) => toasts.push([k, m]);
+globalThis.API_BASE_URL = "/api";
+globalThis.CURRENT_PROJECT_ID_KEY = "pid";
+globalThis.localStorage = { getItem: () => "P1" };
+globalThis.openLogicPicker = (done, lib) => { sent.push(["pre", lib.layer, lib.libOnly, lib.title]);
+  lib.pick({ 층: "company", 주인: "7", 키: "SC-000002" }, "회사 조합"); };
+globalThis.openItemPicker = async () => ({ action: "apply",
+  item: { layer: "system", owner: null, key: "SS000011", name: "관매설" } });
+const answer = { 폴더: "precombo@company@7@SC-000002", 만듦: true, key: "DG:new",
+  payload: { user: { bill: "서버 것" }, inputs: { daega: { libs: {} } },
+    sheets: { daega: [{ key: "DG:new", name: "회사 조합", spec: "", unit: "㎡" }] } } };
+globalThis.fetch = async (url, init) => { sent.push([url, JSON.parse(init.body)]);
+  return { ok: true, status: 200, json: async () => answer }; };
+const ctx = { sheets: {}, payload: { inputs: { old: 1 } }, user: { keep: 1 }, setUser() {} };
+const applied = [];
+const apply = (ref, from) => applied.push([ref, from && from.name]);
+const [picks, more] = linkItems(ctx, { tab: "dg", key: "DG:a" }, apply);
+const out = { picks: picks.map((x) => x[0]), more: more.map((x) => x[0]) };
+picks.find((x) => x[0].startsWith("서고 일위대가"))[1]();
+await new Promise((r) => setTimeout(r, 0));
+picks.find((x) => x[0].startsWith("서고 구조물"))[1]();
+await new Promise((r) => setTimeout(r, 0));
+await new Promise((r) => setTimeout(r, 0));
+Object.assign(out, { sent, applied, payload: ctx.payload, toasts });
+console.log(JSON.stringify(out));
+"""
+
+
+def test_화면_출처_다섯_사전조합_창_들여오기_줄_연결_TS():
+    src = IMPORTS.sub(
+        "", (ROOT / "B09_Estimation/B09_Estimation_UI_Tabs_Bill_Link.ts").read_text("utf-8")
+    )
+    result = subprocess.run(
+        ["node", "--experimental-strip-types", "--no-warnings",
+         "--input-type=module-typescript"],
+        input=src + LINK_JS, capture_output=True, text=True, encoding="utf-8", timeout=60,
+    )  # fmt: skip
+    assert result.returncode == 0, result.stderr
+    out = json.loads(result.stdout)
+    assert out["picks"] == [
+        "일위대가 호표",
+        "단가산출 호표",
+        "서고 구조물조합(마스터 · 회사 · 개인)",
+        "서고 일위대가 사전조합(마스터 · 회사 · 개인)",
+        "단가산출 로직(M01 · 새 산근)",
+    ]
+    assert out["more"] == ["연결 풀기"]
+    pre, (url, body) = out["sent"][0], out["sent"][1]
+    assert pre == ["pre", "personal", True, "일위대가 사전조합 고르기"]  # 서고 줄만 · 층 셋
+    assert url == "/api/projects/P1/estimation/library"
+    assert body == {"kind": "precombo", "layer": "company", "owner": "7", "key": "SC-000002"}
+    assert out["sent"][2][1] == {"kind": "combo", "layer": "system", "owner": None,
+                                 "key": "SS000011"}  # fmt: skip
+    ref = {"tab": "dg", "key": "DG:new", "lib": "precombo@company@7@SC-000002"}
+    assert out["applied"][0] == [ref, "회사 조합"]
+    # 원가 자료만 바꿔 끼움 — 사용자 값(서버 user)은 안 받음
+    assert "user" not in out["payload"] and out["payload"]["inputs"] == {"daega": {"libs": {}}}
+    assert out["toasts"][-1][0] == "success"