diff --git a/A00_Common/b_page_state.ts b/A00_Common/b_page_state.ts
index 75850c9cb..23ec0d270 100644
--- a/A00_Common/b_page_state.ts
+++ b/A00_Common/b_page_state.ts
@@ -166,6 +166,8 @@ export const STATE_REGISTRY = {
   crossdesign: { bucket: "draft", scope: "route" },
   /** B08 홍수량 계산서 입력 `{측점: 입력}` — [저장] 때 B08 자기 파일로 · B05 연결값과 같은 칸은 null(연동 · 96). */
   "b08-hydro": { bucket: "draft", scope: "project", version: 3 },
+  /** B08 좌측 패널 옵션 `{one_pipe_length_m, soft_rock_pct}` — [저장] 때 M02 표 변수 · project_settings 로(122). */
+  "b08-options": { bucket: "draft", scope: "project" },
   /** 미저장 계획고 편집(▲▼ · 곡선반경) — 설계 가게 `alignmentDraft` 의 칸(계획서 24-2c).
    *  옛 키는 노선 번호만 붙은 `b05-profile-alignment-draft:{노선}` 이었다. */
   "alignment-draft": {
diff --git a/B08_Quantity/B08_Quantity_Options_Calc.ts b/B08_Quantity/B08_Quantity_Options_Calc.ts
new file mode 100644
index 000000000..b4f33256c
--- /dev/null
+++ b/B08_Quantity/B08_Quantity_Options_Calc.ts
@@ -0,0 +1,108 @@
+/* =============================================================================
+ * B08_Quantity_Options_Calc.ts
+ * 좌측 패널 옵션 — 조작 중 브라우저가 바로 다시 세는 식(화면 없음 · PLAN 122).
+ *
+ *   짝(파이썬 · 같은 식) — 거울 시험 `test_122_b08_options_mirror`:
+ *     couplings · recountCouplings  ↔  `B08_Quantity_Router_Summary.py` couplings(관마다 `pipes`)
+ *     rockSplit · splitRockColumns · splitRockSummary
+ *                                   ↔  `B08_Quantity_Engine_Earthwork_Summary.py` rock_split ·
+ *                                      split_rock_columns · summary_rows(연암 · 경암 네 줄)
+ *   [저장] 뒤에는 서버가 정본으로 다시 셈 — 여기 값을 받아 적지 않음.
+ *   import 없음 — 시험이 이 파일만 옮겨 돌림.
+ * ========================================================================== */
+
+/** 커플링 = 올림(L ÷ 1본) − 1(0 아래 없음) · 길이나 1본이 빈칸이면 null. */
+export function couplings(lengthM: number | null | undefined, oneM: number | null): number | null {
+  if (!lengthM || !oneM) return null;
+  return Math.max(Math.ceil(lengthM / oneM - 1e-9) - 1, 0);
+}
+
+export interface PipeLength {
+  chainage_m: number;
+  /** 커플링 열 id(`pipe:cp|관경`) */
+  column: string;
+  length_m: number | null;
+}
+
+interface CouplingSummary {
+  rows: Array<{ chainage_m: number; values: Record<string, number> }>;
+  total: Record<string, number>;
+  pipes: PipeLength[];
+}
+
+/** 커플링 열만 새 1본 길이로 — 같은 측점(1 cm)의 같은 열은 더함 · 계 = 줄 합. */
+export function recountCouplings<S extends CouplingSummary>(summary: S, oneM: number | null): S {
+  const at = (chainage: number): number => Math.round(chainage * 100);
+  const columns = new Set(summary.pipes.map((pipe) => pipe.column));
+  const sums = new Map<string, number>();
+  for (const pipe of summary.pipes) {
+    const count = couplings(pipe.length_m, oneM);
+    if (count === null) continue;
+    const key = `${at(pipe.chainage_m)}|${pipe.column}`;
+    sums.set(key, (sums.get(key) ?? 0) + count);
+  }
+  const keep = (values: Record<string, number>): Record<string, number> =>
+    Object.fromEntries(Object.entries(values).filter(([id]) => !columns.has(id)));
+  const rows = summary.rows.map((row) => {
+    const values = keep(row.values);
+    for (const column of columns) {
+      const count = sums.get(`${at(row.chainage_m)}|${column}`);
+      if (count !== undefined) values[column] = count;
+    }
+    return { ...row, values };
+  });
+  const total = keep(summary.total);
+  for (const row of rows)
+    for (const column of columns)
+      if (row.values[column] !== undefined)
+        total[column] = (total[column] ?? 0) + row.values[column];
+  return { ...summary, rows, total };
+}
+
+/** 0~100 으로 자름 · 숫자가 아니면 null. */
+export function clampPct(value: number): number | null {
+  return Number.isFinite(value) ? Math.min(Math.max(value, 0), 100) : null;
+}
+
+/** 암 → [연암, 경암] — 연암 = 암 × 비율(0~100 자름) · 경암 = 암 − 연암. */
+export function rockSplit(value: number, softPct: number): [number, number] {
+  const soft = (value * Math.min(Math.max(softPct, 0), 100)) / 100;
+  return [soft, value - soft];
+}
+
+const ROCK_SPLIT = [
+  ["cut_rock", "cut_soft_rock", "cut_hard_rock"],
+  ["ditch_rock", "ditch_soft_rock", "ditch_hard_rock"],
+] as const;
+const ROCK_SUFFIXES = ["area_m2", "volume_m3", "adjusted_m3"] as const;
+
+/** 줄 · 합계의 암 칸마다 연암 · 경암 칸을 덮어씀(숫자인 칸만). */
+export function splitRockColumns(record: Record<string, unknown>, softPct: number): void {
+  for (const [base, softKey, hardKey] of ROCK_SPLIT)
+    for (const suffix of ROCK_SUFFIXES) {
+      const value = record[`${base}_${suffix}`];
+      if (typeof value !== "number") continue;
+      const [soft, hard] = rockSplit(value, softPct);
+      record[`${softKey}_${suffix}`] = soft;
+      record[`${hardKey}_${suffix}`] = hard;
+    }
+}
+
+/** 토공집계표 연암 · 경암 줄 — 흙깍기 = 절토 암 · 측구 터파기 = 측구 암 합계 × 비율 · 반올림 정수. */
+const ROCK_ROWS: Record<string, string> = {
+  흙깍기: "cut_rock_volume_m3",
+  "측구 터파기": "ditch_rock_volume_m3",
+};
+
+export function splitRockSummary<R extends { group: string; kind: string; value: number | null }>(
+  rows: readonly R[],
+  totals: Record<string, number>,
+  softPct: number,
+): R[] {
+  return rows.map((row) => {
+    const base = ROCK_ROWS[row.group];
+    if (!base || (row.kind !== "연암" && row.kind !== "경암")) return row;
+    const [soft, hard] = rockSplit(totals[base] ?? 0, softPct);
+    return { ...row, value: Math.round(row.kind === "연암" ? soft : hard) };
+  });
+}
diff --git a/B08_Quantity/B08_Quantity_Router_Options.py b/B08_Quantity/B08_Quantity_Router_Options.py
new file mode 100644
index 000000000..27fbaae3b
--- /dev/null
+++ b/B08_Quantity/B08_Quantity_Router_Options.py
@@ -0,0 +1,91 @@
+"""B08 좌측 패널 옵션 길(PLAN 122) — 배관 1본 길이 · 연암 / 경암 비율.
+
+    GET /api/projects/{id}/quantity/options   지금 값
+    PUT /api/projects/{id}/quantity/options   [저장] — 받은 칸만 정본 자리에 씀
+
+1본 길이 = 프로젝트 층 M02 구조물집계표 변수 `파형강관_1본_m` 한 벌(98 `one_pipe_length` 이 읽는 자리 ·
+M02 표 식 `[$파형강관_1본_m]` 도 같은 값) · 프로젝트 사본이 없으면 시스템 층 문서를 바탕으로 깔고 씀 ·
+M02 [초기화]면 같이 되돌아감.
+연암 % = `project_settings.json › quantity › rock_ratios_pct`(연암 · 경암 = 100 − 연암) · 기본 90 은
+파일에 안 쓰고 읽을 때 채움(`soft_rock_pct`).
+"""
+
+from __future__ import annotations
+
+import asyncio
+from pathlib import Path
+from typing import Any
+from uuid import UUID
+
+from fastapi import APIRouter, HTTPException
+from pydantic import BaseModel, Field
+
+from B08_Quantity.B08_Quantity_Router_Hydro import _project_root
+from B08_Quantity.B08_Quantity_Router_Summary import ONE_LENGTH_VAR, TABLE_NAME, one_pipe_length
+from common_util.common_util_project_settings import quantity_settings, save_section, soft_rock_pct
+from M02_MasterTemplete import M02_Template_Layers as layers
+
+router = APIRouter(prefix="/api/projects", tags=["B08 Options"])
+
+
+class OptionsSave(BaseModel):
+    """빈칸(None) = 그 칸은 그대로."""
+
+    one_pipe_length_m: float | None = Field(default=None, gt=0, le=100)
+    soft_rock_pct: float | None = Field(default=None, ge=0, le=100)
+
+
+def read_options(root: str | Path) -> dict[str, Any]:
+    soft = soft_rock_pct(quantity_settings(root))
+    return {
+        "one_pipe_length_m": one_pipe_length(root),
+        "rock_ratios_pct": {"연암": soft, "경암": 100.0 - soft},
+    }
+
+
+def _write_one_pipe(root: str | Path, value: float) -> None:
+    """프로젝트 층 구조물집계표 변수 한 칸 — 판이 그새 바뀌었으면 `StaleTemplate`."""
+    folder = layers.project_dir(root)
+    found = layers.read_template(folder, "table", TABLE_NAME)
+    version = found["판"] if found else None
+    found = found or layers.read_template(layers.system_dir(), "table", TABLE_NAME)
+    if found is None:
+        raise HTTPException(status_code=404, detail=f"{TABLE_NAME} 양식이 없습니다 — M02 표부터.")
+    document = found["문서"]
+    document["변수"] = {**(document.get("변수") or {}), ONE_LENGTH_VAR: value}
+    layers.write_template(
+        folder, "table", TABLE_NAME, document, version=version, check_version=True
+    )
+
+
+def save_options(root: str | Path, body: OptionsSave) -> dict[str, Any]:
+    if body.one_pipe_length_m is not None:
+        _write_one_pipe(root, body.one_pipe_length_m)
+    if body.soft_rock_pct is not None:
+        soft = float(body.soft_rock_pct)
+        ratios = {
+            **(quantity_settings(root).get("rock_ratios_pct") or {}),
+            "연암": soft,
+            "경암": 100.0 - soft,
+        }
+        save_section(
+            root, "quantity", {"rock_ratios_pct": ratios}, replace_keys=("rock_ratios_pct",)
+        )
+    return read_options(root)
+
+
+@router.get("/{project_id}/quantity/options")
+async def options_read(project_id: UUID) -> dict[str, Any]:
+    root = await _project_root(project_id)
+    return await asyncio.to_thread(read_options, root)
+
+
+@router.put("/{project_id}/quantity/options")
+async def options_save(project_id: UUID, body: OptionsSave) -> dict[str, Any]:
+    root = await _project_root(project_id)
+    try:
+        return await asyncio.to_thread(save_options, root, body)
+    except layers.StaleTemplate as error:
+        raise HTTPException(
+            status_code=409, detail="구조물집계표가 그새 바뀌었습니다 — 다시 열고 저장하세요."
+        ) from error
diff --git a/B08_Quantity/B08_Quantity_UI_Hydro.ts b/B08_Quantity/B08_Quantity_UI_Hydro.ts
index 07450ae0c..5056c993a 100644
--- a/B08_Quantity/B08_Quantity_UI_Hydro.ts
+++ b/B08_Quantity/B08_Quantity_UI_Hydro.ts
@@ -44,7 +44,7 @@ interface HydroStation {
 type Drafts = Record<string, Partial<HydroInputs>>;
 type HydroPayload = { stations: HydroStation[]; saved: Drafts } & HydroOptions;
 
-async function request<T>(path: string, init: RequestInit = {}): Promise<T> {
+export async function request<T>(path: string, init: RequestInit = {}): Promise<T> {
   const response = await fetch(`${API_BASE_URL}${path}`, {
     credentials: "include",
     headers: { "Content-Type": "application/json" },
diff --git a/B08_Quantity/B08_Quantity_UI_Options.ts b/B08_Quantity/B08_Quantity_UI_Options.ts
new file mode 100644
index 000000000..d994e765d
--- /dev/null
+++ b/B08_Quantity/B08_Quantity_UI_Options.ts
@@ -0,0 +1,201 @@
+/* =============================================================================
+ * B08_Quantity_UI_Options.ts
+ * 좌측 패널(PLAN 122) — 메인 탭과 같은 컨테이너 셋(구조물 · 토공 · 수리집수면적표 · 접이) + [저장] 줄.
+ *
+ *   구조물 › 배관 1본 길이(m) — 정본 = 프로젝트 층 M02 구조물집계표 변수 `파형강관_1본_m`
+ *   토공 › 연암 % · 경암 %(암 전체 기준 · 한쪽 고치면 다른 쪽 = 100 − 값 · 0~100)
+ *   수리집수면적표 — 빈 자리(다음 옵션)
+ *   조작 = 캐시 `b08-options` 즉시 + 열린 표가 같은 식으로 바로 다시 셈(`…_Options_Calc`) ·
+ *   [저장] = PUT …/quantity/options → 캐시 비움 · 열린 탭을 서버 정본으로 다시 그림 · 자동 저장 없음.
+ * ========================================================================== */
+
+import {
+  createButton,
+  createInputField,
+  hideLoadingOverlay,
+  showLoadingOverlay,
+  showToast,
+} from "@ui/ui_template_elements";
+import { attachCollapsible } from "@ui/ui_template_collapsible";
+import { ui_locales, currentLanguageIndex } from "@ui/ui_template_locale";
+import { clearState, readState, writeState } from "../A00_Common/b_page_state";
+import { request } from "./B08_Quantity_UI_Hydro";
+import { clampPct } from "./B08_Quantity_Options_Calc";
+
+function L(key: keyof typeof ui_locales): string {
+  return ui_locales[key][currentLanguageIndex];
+}
+
+/** 조작 중 값 — 없는 칸은 저장본 그대로 · 1본 null = 빈칸. */
+export interface OptionsDraft {
+  one_pipe_length_m?: number | null;
+  soft_rock_pct?: number;
+}
+
+interface SavedOptions {
+  one_pipe_length_m: number | null;
+  rock_ratios_pct: { 연암: number; 경암: number };
+}
+
+const changes = new EventTarget();
+
+const readDraft = (projectId: string): OptionsDraft =>
+  readState<OptionsDraft>("b08-options", projectId) ?? {};
+
+/** 지금 1본 길이 — 캐시 → 저장본. */
+export function liveOnePipe(projectId: string, saved: number | null): number | null {
+  const draft = readDraft(projectId);
+  return draft.one_pipe_length_m !== undefined ? draft.one_pipe_length_m : saved;
+}
+
+/** 지금 연암 % — 캐시 → 저장본. */
+export function liveSoftRock(projectId: string, saved: number): number {
+  return readDraft(projectId).soft_rock_pct ?? saved;
+}
+
+/** host 가 화면에 붙어 있는 동안 옵션이 바뀔 때마다 fn — 떨어진 뒤 첫 알림에서 스스로 뗌. */
+export function onOptionsChange(host: HTMLElement, fn: () => void): void {
+  const listener = (): void => {
+    if (host.isConnected) fn();
+    else changes.removeEventListener("change", listener);
+  };
+  changes.addEventListener("change", listener);
+}
+
+const pctText = (value: number): string => String(Math.round(value * 1e6) / 1e6);
+
+function card(id: string, title: keyof typeof ui_locales, ...body: HTMLElement[]): HTMLElement {
+  const section = document.createElement("section");
+  section.className = "ui-collapsible ui-sidebar-section ui-sidebar-card";
+  section.dataset.b08Options = id;
+  const heading = document.createElement("h3");
+  heading.className = "ui-collapsible__title";
+  heading.textContent = L(title);
+  section.append(heading, ...body);
+  return section;
+}
+
+function hint(text: string): HTMLElement {
+  const p = document.createElement("p");
+  p.className = "b08-options__hint";
+  p.textContent = text;
+  return p;
+}
+
+/** 좌측 패널 — 맨 끝 `.ui-sidebar-actions` 줄([저장] · [?] 자리). `onSaved` = 열린 탭 다시 그림. */
+export function createOptionsPanel(projectId: string | null, onSaved: () => void): HTMLElement {
+  const one = createInputField({
+    label: "배관 1본 길이 (m)",
+    type: "number",
+    compact: true,
+    min: 0,
+  });
+  const soft = createInputField({
+    label: "연암 (%)",
+    type: "number",
+    compact: true,
+    min: 0,
+    max: 100,
+  });
+  const hard = createInputField({
+    label: "경암 (%)",
+    type: "number",
+    compact: true,
+    min: 0,
+    max: 100,
+  });
+  one.input.dataset.b08Option = "one_pipe_length_m";
+  soft.input.dataset.b08Option = "soft_rock_pct";
+  hard.input.dataset.b08Option = "hard_rock_pct";
+  const rockRow = document.createElement("div");
+  rockRow.className = "b08-options__row";
+  rockRow.append(soft.root, hard.root);
+
+  let saved: { one: number | null; soft: number } = { one: 8, soft: 90 };
+  const show = (): void => {
+    const draft = projectId ? readDraft(projectId) : {};
+    const oneM = draft.one_pipe_length_m !== undefined ? draft.one_pipe_length_m : saved.one;
+    const softPct = draft.soft_rock_pct ?? saved.soft;
+    one.input.value = oneM == null ? "" : String(oneM);
+    soft.input.value = pctText(softPct);
+    hard.input.value = pctText(100 - softPct);
+  };
+  const put = (patch: OptionsDraft): void => {
+    if (!projectId) return;
+    writeState("b08-options", { ...readDraft(projectId), ...patch }, projectId);
+    changes.dispatchEvent(new Event("change"));
+  };
+
+  one.input.addEventListener("input", () => {
+    const value = Number(one.input.value);
+    put({ one_pipe_length_m: one.input.value.trim() && value > 0 ? value : null });
+  });
+  // 한쪽을 고치면 다른 쪽 = 100 − 값 · 칸을 떠나면 자른 값으로 다시 씀
+  const pair = (from: HTMLInputElement, other: HTMLInputElement, isSoft: boolean): void => {
+    from.addEventListener("input", () => {
+      const value = from.value.trim() ? clampPct(Number(from.value)) : null;
+      if (value === null) return;
+      other.value = pctText(100 - value);
+      put({ soft_rock_pct: isSoft ? value : 100 - value });
+    });
+    from.addEventListener("change", show);
+  };
+  pair(soft.input, hard.input, true);
+  pair(hard.input, soft.input, false);
+
+  const saveAll = async (): Promise<void> => {
+    if (!projectId) return;
+    const draft = readDraft(projectId);
+    if (draft.one_pipe_length_m === null) {
+      showToast("배관 1본 길이를 넣으세요 — 0 보다 큰 값.", "error");
+      return;
+    }
+    showLoadingOverlay();
+    try {
+      const body = await request<SavedOptions>(`/projects/${projectId}/quantity/options`, {
+        method: "PUT",
+        body: JSON.stringify(draft),
+      });
+      saved = { one: body.one_pipe_length_m, soft: body.rock_ratios_pct.연암 };
+      clearState("b08-options", projectId);
+      show();
+      showToast("수량 산출 옵션을 저장했습니다.", "success");
+      onSaved();
+    } catch (error) {
+      showToast(`저장하지 못했습니다 — ${String(error)}`, "error");
+    } finally {
+      hideLoadingOverlay();
+    }
+  };
+
+  const save = createButton({
+    label: L("B08_Quantity_Btn_Save"),
+    variant: "filled",
+    onClick: () => void saveAll(),
+  });
+  save.dataset.b08OptionsSave = "";
+  const actions = document.createElement("div");
+  actions.className = "ui-sidebar-actions";
+  actions.append(save);
+
+  const panel = document.createElement("div");
+  panel.className = "ui-sidebar-panel b08-options";
+  panel.append(
+    card("structure", "B08_Quantity_Tab_Structure", one.root),
+    card("earthwork", "B08_Quantity_Tab_Earthwork", rockRow, hint("암 전체 기준 · 두 칸 합 100")),
+    card("hydrology", "B08_Quantity_Tab_Hydrology", hint("다음 옵션 자리")),
+    actions,
+  );
+  attachCollapsible(panel);
+  show();
+
+  if (projectId)
+    request<SavedOptions>(`/projects/${projectId}/quantity/options`).then(
+      (body) => {
+        saved = { one: body.one_pipe_length_m, soft: body.rock_ratios_pct.연암 };
+        show();
+      },
+      (error: unknown) => showToast(`옵션을 불러오지 못했습니다 — ${String(error)}`, "error"),
+    );
+  return panel;
+}
diff --git a/B08_Quantity/B08_Quantity_UI_Page.css b/B08_Quantity/B08_Quantity_UI_Page.css
index a74e7d678..332249424 100644
--- a/B08_Quantity/B08_Quantity_UI_Page.css
+++ b/B08_Quantity/B08_Quantity_UI_Page.css
@@ -18,3 +18,16 @@
   padding-bottom: var(--spacing-8);
   border-bottom: 1px solid var(--color-border);
 }
+
+/* 좌측 패널 옵션(122) — 연암 · 경암 두 칸 나란히 · 설명 한 줄 */
+.b08-options__row {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: var(--spacing-8);
+}
+
+.b08-options__hint {
+  margin: var(--spacing-4) 0 0;
+  color: var(--color-text-secondary);
+  font-size: var(--text-caption);
+}
diff --git a/B08_Quantity/B08_Quantity_UI_Page.ts b/B08_Quantity/B08_Quantity_UI_Page.ts
index c2621bab7..6982d8c84 100644
--- a/B08_Quantity/B08_Quantity_UI_Page.ts
+++ b/B08_Quantity/B08_Quantity_UI_Page.ts
@@ -6,6 +6,7 @@
  *   구조물 아래 보조 탭 = 구조물 집계표(61-1) · 총괄자재수량집계표 · 콘크리트소요자재집계표 ·
  *   자재수량집계표(셋은 아직 빈 탭) — 구조물도는 집계표 행을 눌러 여는 모달(95-3).
  *   옛 수량 산출 코드(`old_code/B08_Quantity/`)는 가져오지 않음 — 새로 씀.
+ *   좌측 패널 = 메인 탭과 같은 컨테이너 셋 + [저장] 줄(`B08_Quantity_UI_Options` · PLAN 122).
  * ========================================================================== */
 
 import "@ui/ui_template_general_layout.css";
@@ -19,6 +20,7 @@ import { goToWorkflowStage, WORKFLOW_STEP_ROUTES } from "../A00_Common/b_workflo
 import { renderStructureSummary } from "./B08_Quantity_UI_Summary";
 import { renderHydro } from "./B08_Quantity_UI_Hydro";
 import { renderEarthwork } from "./B08_Quantity_UI_Earthwork";
+import { createOptionsPanel } from "./B08_Quantity_UI_Options";
 
 function L(key: keyof typeof ui_locales): string {
   return ui_locales[key][currentLanguageIndex];
@@ -99,7 +101,9 @@ export function renderB08Quantity(root: HTMLElement): void {
   panel.className = "b08-quantity__panel";
   panel.setAttribute("role", "tabpanel");
 
+  let current: TabId = "structure";
   const select = (tab: TabId): void => {
+    current = tab;
     tabBar.replaceChildren(
       ...TABS.map(({ id, label }) => {
         const button = createButton({
@@ -126,6 +130,8 @@ export function renderB08Quantity(root: HTMLElement): void {
     steps: workflowSteps(),
     activeStep: 5,
     mainContent: body,
+    // [저장] 뒤 열린 탭을 서버 정본으로 다시 그림
+    leftPanel: createOptionsPanel(projectId, () => select(current)),
     routes: WORKFLOW_STEP_ROUTES,
     onStepClick: (stepIndex: number) => {
       if (projectId) goToWorkflowStage(projectId, WORKFLOW_STEP_ROUTES[stepIndex]);
diff --git a/common_util/common_util_project_settings.py b/common_util/common_util_project_settings.py
index 68c8fcc21..66157aecb 100644
--- a/common_util/common_util_project_settings.py
+++ b/common_util/common_util_project_settings.py
@@ -253,6 +253,21 @@ def quantity_settings(project_root: str | Path) -> dict[str, Any]:
     return load_settings(project_root).get("quantity") or {}
 
 
+#: 연암 % 기본 — 암 전체 기준 · 경암 = 100 − 연암 · 파일에 안 쓰고 읽을 때 채움(PLAN 122)
+SOFT_ROCK_PCT_DEFAULT = 90.0
+
+
+def soft_rock_pct(settings: dict[str, Any]) -> float:
+    """연암 %(0~100) — `rock_ratios_pct` 연암 · 없으면 100 − 경암 · 둘 다 없으면 기본 90."""
+    ratios = settings.get("rock_ratios_pct") or {}
+    for name, flip in (("연암", False), ("경암", True)):
+        value = ratios.get(name)
+        if isinstance(value, (int, float)) and not isinstance(value, bool):
+            pct = min(max(float(value), 0.0), 100.0)
+            return 100.0 - pct if flip else pct
+    return SOFT_ROCK_PCT_DEFAULT
+
+
 def estimation_settings(project_root: str | Path) -> dict[str, Any]:
     """B09 구획만 꺼낸다 — 범위 계수·장비 규격처럼 **사용자가 고른 단가 조건**이 여기 산다."""
     return load_settings(project_root).get("estimation") or {}
diff --git a/main.py b/main.py
index 1205b1eb6..31e5d193d 100644
--- a/main.py
+++ b/main.py
@@ -65,6 +65,7 @@ from B07_DesignDetail.B07_DesignDetail_Router_Frame import router as b07_frame_r
 from B07_DesignDetail.B07_DesignDetail_Router_PlanKinds import router as b07_plan_kinds_router
 from B08_Quantity.B08_Quantity_Router_Earthwork import router as b08_earthwork_router
 from B08_Quantity.B08_Quantity_Router_Hydro import router as b08_hydro_router
+from B08_Quantity.B08_Quantity_Router_Options import router as b08_options_router
 from B08_Quantity.B08_Quantity_Router_Summary import router as b08_summary_router
 from M01_MasterData.M01_MasterData_Router import router as m01_master_data_router
 from M02_MasterTemplete.M02_Labor_Router import router as m02_labor_router
@@ -649,6 +650,7 @@ app.include_router(b07_plan_kinds_router, dependencies=protected_with_company)
 app.include_router(b08_hydro_router, dependencies=protected_with_company)
 app.include_router(b08_earthwork_router, dependencies=protected_with_company)
 app.include_router(b08_summary_router, dependencies=protected_with_company)
+app.include_router(b08_options_router, dependencies=protected_with_company)
 # B08 수량·B09 원가계산 라우터 13 개는 끊음 — 코드는 `old_code/` 에 있고 화면은 빈 틀만 뜬다(PLAN 7-3).
 # 마스터 데이터 — 회사·프로젝트가 아니라 시스템 관리자만 본다.
 system_admin_only = [Depends(verify_session), Depends(require_system_admin)]