diff --git a/M02_MasterTemplete/M02_MasterTemplete_Store.py b/M02_MasterTemplete/M02_MasterTemplete_Store.py
index 13e8a2c8..5aadc5ed 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_Store.py
+++ b/M02_MasterTemplete/M02_MasterTemplete_Store.py
@@ -60,7 +60,13 @@ def version_of(raw: bytes) -> str:
 def _path(kind: str, name: str) -> Path:
     if kind not in KINDS:
         raise StoreError(404, f"없는 종류 「{kind}」")
-    if not name or name != name.strip() or name.startswith(".") or _BAD_NAME.search(name):
+    if (
+        not name
+        or name != name.strip()
+        or name.startswith((".", "_"))  # `_` 도 막음 — 새 프로젝트 복사(layers.check_name)가 거절함
+        or len(name) > 80  # 파일 이름이 길면 OS 가 죽음(500) — 화면 규칙과 같은 80자
+        or _BAD_NAME.search(name)
+    ):
         raise StoreError(400, f"쓸 수 없는 글자가 있는 이름 「{name}」")
     return FOLDER / kind / f"{name}.json"
 
diff --git a/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts b/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts
index 207f3fe3..80b5c960 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts
@@ -9,7 +9,6 @@
 import {
   createButton,
   createInputField,
-  createSelectField,
   el,
   showConfirmDialog,
   showToast,
@@ -87,7 +86,10 @@ export interface SideHandle {
 
 /** 서버 이름 규칙과 같게 — 화면에서 먼저 막음 */
 const badName = (name: string): boolean =>
-  /[\\/:*?"<>|\x00-\x1f]|\.\./.test(name) || name.startsWith(".");
+  /[\\/:*?"<>|\x00-\x1f]|\.\./.test(name) ||
+  name.startsWith(".") ||
+  name.startsWith("_") ||
+  name.length > 80;
 
 const why = (error: unknown): string => (error instanceof Error ? error.message : "");
 const failed = (error: unknown): void =>
@@ -113,25 +115,30 @@ export function buildSide(opt: SideOptions): SideHandle {
   const columnBodies = COLUMN_KINDS.map(() =>
     el("div", { className: "m02-side__items ui-sidebar-list" }),
   );
+  /** 새로 · 본떠 만들기 · 지우기 — 표 · 도면 컨테이너 안에 하나씩(그 종류로 동작) · 관리자만 */
+  const editButtons = new Map<Kind, { copy: HTMLButtonElement; del: HTMLButtonElement }>();
+  const actionRow = (kind: Kind): HTMLElement[] => {
+    if (!canEdit(layer, opt.isAdmin)) return [];
+    const btnNew = createButton({ label: L("M02_New"), variant: "filled" });
+    const copy = createButton({ label: L("M02_Copy"), variant: "ghost" });
+    const del = createButton({ label: L("M02_Delete"), variant: "danger" });
+    editButtons.set(kind, { copy, del });
+    btnNew.addEventListener("click", () => newTemplate(kind));
+    copy.addEventListener("click", copyTemplate);
+    del.addEventListener("click", () => void deleteCurrent());
+    return [el("div", { className: "m02-side__row", children: [btnNew, copy, del] })];
+  };
   const listHost = el("div", {
     className: "m02-side__lists ui-sidebar-panel",
     children: [
-      section(L("M02_KindTable"), bodies.get("table")!),
-      section(L("M02_KindDrawing"), bodies.get("drawing")!),
+      section(L("M02_KindTable"), bodies.get("table")!, ...actionRow("table")),
+      section(L("M02_KindDrawing"), bodies.get("drawing")!, ...actionRow("drawing")),
       ...COLUMN_KINDS.map((k, i) => section(k.label(), columnBodies[i])),
     ],
   });
   attachCollapsible(listHost);
 
-  const btnNew = createButton({ label: L("M02_New"), variant: "filled" });
-  const btnCopy = createButton({ label: L("M02_Copy"), variant: "ghost" });
-  const btnDel = createButton({ label: L("M02_Delete"), variant: "danger" });
-  const editRow = el("div", {
-    className: "m02-side__row ui-sidebar-card",
-    children: [btnNew, btnCopy, btnDel],
-  });
-
-  const root = el("div", { className: "m02-side ui-sidebar-panel", children: [listHost, editRow] });
+  const root = el("div", { className: "m02-side ui-sidebar-panel", children: [listHost] });
 
   /** 고름 표시 — `picked`(방금 누름) 이 있으면 그것 · 없으면 지금 열린 것과 비교 */
   const isPicked = (kind: Kind, name: string): boolean => {
@@ -186,11 +193,10 @@ export function buildSide(opt: SideOptions): SideHandle {
   const paintColumns = (): void =>
     COLUMN_KINDS.forEach((k, i) => paintRows(columnBodies[i], k.kind, k.key));
 
+  /** 본떠 만들기 · 지우기 — 그 컨테이너에서 고른(열린) 양식이 있을 때만 켜짐 */
   function paintButtons(): void {
-    const editable = canEdit(layer, opt.isAdmin);
-    btnNew.disabled = !editable;
-    btnCopy.disabled = !editable || !currentInfo();
-    btnDel.disabled = !editable || !currentInfo();
+    const cur = currentInfo();
+    for (const [kind, b] of editButtons) b.copy.disabled = b.del.disabled = cur?.종류 !== kind;
   }
 
   async function select(info: TemplateInfo): Promise<void> {
@@ -243,16 +249,8 @@ export function buildSide(opt: SideOptions): SideHandle {
   }
 
   /* --- 시스템 층 새로 · 본떠 · 지우기(표 · 도면만 — 구조물 도면은 집계표 열이 정함) --- */
-  const nameDialog = (
-    title: string,
-    withKind: boolean,
-    onOk: (kind: Kind, name: string) => Promise<void>,
-  ): void => {
+  const nameDialog = (title: string, onOk: (name: string) => Promise<void>): void => {
     const name = createInputField({ label: L("M02_Name"), placeholder: L("M02_Name") });
-    const kind = createSelectField({
-      label: L("M02_Kind"),
-      options: KINDS.map((k) => ({ value: k.kind, text: k.label() })),
-    });
     openModal({
       title,
       closeLabel: L("M02_Close"),
@@ -265,7 +263,7 @@ export function buildSide(opt: SideOptions): SideHandle {
           if (badName(text)) return showToast(L("M02_BadName"), "error");
           ok.disabled = true; // 연달아 눌러도 한 번만
           try {
-            await onOk(kind.select.value as Kind, text);
+            await onOk(text);
             close();
           } catch (error) {
             if (error instanceof StaleError) showToast(L("M02_NameExists"), "error");
@@ -274,7 +272,7 @@ export function buildSide(opt: SideOptions): SideHandle {
             ok.disabled = false;
           }
         });
-        body.append(...(withKind ? [kind.root] : []), name.root, ok);
+        body.append(name.root, ok);
         name.input.focus();
       },
     });
@@ -287,22 +285,25 @@ export function buildSide(opt: SideOptions): SideHandle {
     if (info) await select(info);
   };
 
-  btnNew.addEventListener("click", () =>
-    nameDialog(L("M02_NewTitle"), true, async (kind, name) => {
+  /** 이 컨테이너 종류의 새 양식 — 종류 고르기 없이 이름만 */
+  function newTemplate(kind: Kind): void {
+    nameDialog(L("M02_NewTitle"), async (name) => {
       await saveTemplate("system", kind, name, null, "", stubDoc(kind, name));
       await openCreated(kind, name);
-    }),
-  );
-  btnCopy.addEventListener("click", () => {
+    });
+  }
+  function copyTemplate(): void {
     const from = currentInfo();
     if (!from) return;
-    nameDialog(L("M02_CopyTitle"), false, async (_kind, name) => {
+    nameDialog(L("M02_CopyTitle"), async (name) => {
       const got = await readTemplate("system", from.종류, from.이름, null);
-      await saveTemplate("system", from.종류, name, null, "", got.문서);
+      // 표 문서 머리 이름(`양식`)도 새 이름으로 — 안 바꾸면 복사본이 원본 이름을 달고 있음
+      const doc = from.종류 === "table" ? { ...(got.문서 as object), 양식: name } : got.문서;
+      await saveTemplate("system", from.종류, name, null, "", doc);
       await openCreated(from.종류, name);
     });
-  });
-  btnDel.addEventListener("click", async () => {
+  }
+  async function deleteCurrent(): Promise<void> {
     await refresh(); // 저장 직후여도 최신 판으로
     const info = currentInfo();
     if (!info) return;
@@ -315,7 +316,7 @@ export function buildSide(opt: SideOptions): SideHandle {
     } catch (error) {
       failed(error);
     }
-  });
+  }
 
   void refresh();
   return {
diff --git a/resources/tester/test_m02_store.py b/resources/tester/test_m02_store.py
index 53f01325..33fa89a0 100644
--- a/resources/tester/test_m02_store.py
+++ b/resources/tester/test_m02_store.py
@@ -5,6 +5,7 @@ from fastapi import FastAPI
 from fastapi.testclient import TestClient
 
 from M02_MasterTemplete import M02_MasterTemplete_Store as store
+from M02_MasterTemplete import M02_Template_Layers as layers
 from M02_MasterTemplete.M02_MasterTemplete_Router import router
 
 
@@ -47,10 +48,42 @@ def test_new_save_reopen_delete_and_stale(client):
 
 
 def test_bad_names_and_kinds(client):
-    for bad in ("a..b", ".숨김", "a%5Cb", "a%3Ab"):
+    for bad in ("a..b", ".숨김", "a%5Cb", "a%3Ab", "_밑줄", "가" * 81):
         got = client.put(f"/api/m02/templates/table/{bad}", json={"판": "", "문서": {"열": []}})
         assert got.status_code == 400 and "쓸 수 없는" in got.json()["detail"]
     assert client.put("/api/m02/templates/other/x", json={"판": "", "문서": {}}).status_code == 404
+    edge = "가" * 80  # 80자는 됨
+    assert (
+        client.put(
+            f"/api/m02/templates/table/{edge}", json={"판": "", "문서": {"열": []}}
+        ).status_code
+        == 200
+    )
+
+
+def test_copy_is_independent_and_seeds_new_project(client, tmp_path, monkeypatch):
+    """본떠 만들기 = 읽어 새 이름으로 새로 저장 — 원본은 안 바뀜 · 새 프로젝트 복사에 실림."""
+    doc = {"format": 6, "entities": [{"type": "line"}], "drawing_area": [1, 2, 3, 4]}
+    client.put("/api/m02/templates/drawing/원본", json={"판": "", "문서": doc})
+    got = client.get("/api/m02/templates/drawing/원본").json()
+    made = client.put("/api/m02/templates/drawing/복사", json={"판": "", "문서": got["문서"]})
+    assert made.status_code == 200
+    assert (
+        client.put("/api/m02/templates/drawing/복사", json={"판": "", "문서": doc}).status_code
+        == 409
+    )
+    copy = client.get("/api/m02/templates/drawing/복사").json()
+    assert copy["문서"] == doc and copy["판"] == got["판"]  # 내용 같음
+    client.put(
+        "/api/m02/templates/drawing/복사",
+        json={"판": copy["판"], "문서": {**doc, "entities": [{"type": "line"}, {"type": "arc"}]}},
+    )
+    assert client.get("/api/m02/templates/drawing/원본").json()["문서"] == doc  # 원본 그대로
+    monkeypatch.setattr(layers, "SYSTEM_ROOT", tmp_path)
+    copied = layers.seed_project(tmp_path / "seed")
+    assert {"drawing/원본", "drawing/복사"} <= set(copied["작업본"])
+    client.delete("/api/m02/templates/drawing/복사")
+    assert [r["이름"] for r in client.get("/api/m02/templates").json()] == ["원본"]
 
 
 def test_empty_doc_rejected_and_file_untouched(client):
diff --git a/resources/tester/test_m02_structure_panel.py b/resources/tester/test_m02_structure_panel.py
index fac6b471..ac370442 100644
--- a/resources/tester/test_m02_structure_panel.py
+++ b/resources/tester/test_m02_structure_panel.py
@@ -140,6 +140,14 @@ def test_미리보기_CAD_패널은_숨기지_않고_접힌_채로_엶():
     assert "isInspectorCollapsed()" in _text(cad / "components/Toolbar.tsx")
 
 
+def test_좌측_새로_본떠_지우기는_표_도면_컨테이너_안에_하나씩():
+    side = _text(SIDE)
+    assert 'actionRow("table")' in side and 'actionRow("drawing")' in side
+    assert "createSelectField" not in side  # 새로 = 종류 고르기 없이 이름만
+    assert "cur?.종류 !== kind" in side  # 본떠 · 지우기 = 그 컨테이너에서 고른 것이 있을 때만
+    assert "양식: name" in side.split("function copyTemplate")[1]  # 복사본 머리 이름 = 새 이름
+
+
 def test_리본_접힘_모드에서_탭으로_편_것은_밖을_누르면_다시_접힘():
     ribbon = _text(ROOT / "B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx")
     assert "if (collapsed) setPeek(true);" in ribbon  # 탭 = 잠깐 펼침(접힘 모드 유지)
diff --git a/ui_template/ui_template_locale_m2.ts b/ui_template/ui_template_locale_m2.ts
index c6c9b2fb..27c7a5a4 100644
--- a/ui_template/ui_template_locale_m2.ts
+++ b/ui_template/ui_template_locale_m2.ts
@@ -42,8 +42,8 @@ export const ui_locales_m2 = {
   M02_NoSpreadsheet: ["산출근거 편집 부품이 아직 없음", "Cost basis editor not available yet"],
   M02_NameExists: ["이미 있는 이름", "That name already exists"],
   M02_BadName: [
-    '쓸 수 없는 글자 — / \\ : * ? " < > | 와 .. · 앞의 점은 안 됨',
-    'Invalid name — no / \\ : * ? " < > | or .. or leading dot',
+    '쓸 수 없는 이름 — / \\ : * ? " < > | 와 .. · 앞의 점 · 밑줄은 안 됨 · 80자까지',
+    'Invalid name — no / \\ : * ? " < > | or .. or leading dot/underscore · up to 80 characters',
   ],
   M02_DiscardConfirm: [
     "저장 안 한 고침이 있음 — 버리고 넘어갈까?",