diff --git a/M01_MasterData/M01_MasterData_UI_LogicLab_Equation.ts b/M01_MasterData/M01_MasterData_UI_LogicLab_Equation.ts
index 4ef848b28..f6a7a6f79 100644
--- a/M01_MasterData/M01_MasterData_UI_LogicLab_Equation.ts
+++ b/M01_MasterData/M01_MasterData_UI_LogicLab_Equation.ts
@@ -16,7 +16,13 @@ import { createBadge } from "@ui/ui_template_badge";
 import { createButton, createIconButton } from "@ui/ui_template_button";
 import { createEqChain } from "@ui/ui_template_equation_line";
 import { createEqSum } from "@ui/ui_template_equation_sum";
-import { eqText, type EqLine, type EqTree, type EqVarRow } from "@ui/ui_template_equation";
+import {
+  eqText,
+  type EqLine,
+  type EqSumHooks,
+  type EqTree,
+  type EqVarRow,
+} from "@ui/ui_template_equation";
 import {
   el,
   hideLoadingOverlay,
@@ -119,6 +125,8 @@ export interface EqPage {
   keep: (edits: EqEdit[]) => void;
   values: () => Record<string, string>;
   setValue: (name: string, value: string | null) => void;
+  /** 소계 표 덧단추 자리(796-2e M02 더한 기초 [연결 끊기]) */
+  sum?: EqSumHooks;
 }
 
 export interface LabEquationOptions {
@@ -458,7 +466,7 @@ export function createLabEquation(opt: LabEquationOptions) {
       return;
     }
     const edit = canEdit();
-    const sum = createEqSum(eq, open);
+    const sum = createEqSum(eq, open, page?.sum);
     body.replaceChildren(
       createEqChain(eq.줄, {
         path: "",
diff --git a/M02_MasterTemplete/M02_MasterTemplete_Sangeun_Equation.ts b/M02_MasterTemplete/M02_MasterTemplete_Sangeun_Equation.ts
index c2f3e4bd9..74c4ddf09 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_Sangeun_Equation.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_Sangeun_Equation.ts
@@ -5,11 +5,14 @@
  *   저장 = 상세 [저장](서버가 다시 얹어 검사 · 셈) · 옵션 = 상세 옵션 값(`onInput`)
  *   위 줄 = 로직 사본 — 「M01 새 판 있음」 배지 · [단가 갱신] · [재생성](`…/sangeun/copy/price|regen` → 문서 `사본할일` · [저장] 때 서버 적용)
  *   가져온 식 = 「엑셀 원래」 금액 글(셈 답 `원래` = 엑셀 금액)
+ *   더한 기초 블록(796-2e · 요구 659-3) — 머리 「연결」 + [연결 끊기](`…/sangeun/block/unlink` → 그 더한줄 `끊음` = 이 SK 안 자기 사본) ·
+ *   「끊음」 + [다시 잇기](`…/block/relink` → 고친 것 버림 · 원본 따라감) · 끊은 블록 속 = 같은 수식 부품(길 몸 `블록`) · 고침 = 그 더한줄 `수식고침`
  * ========================================================================== */
 
 import { createBadge } from "@ui/ui_template_badge";
 import { createButton } from "@ui/ui_template_button";
-import { el, showToast } from "@ui/ui_template_elements";
+import { el, showConfirmDialog, showToast } from "@ui/ui_template_elements";
+import type { EqSumHooks, EqSumRow } from "@ui/ui_template_equation";
 import { currentLanguageIndex } from "@ui/ui_template_locale";
 import { createText } from "@ui/ui_template_text";
 import { createToolbar } from "@ui/ui_template_toolbar";
@@ -28,6 +31,19 @@ const TEXT = {
   Job: ["{n} · [저장] 때 적용", "{n} · applied on save"],
   Excel: ["엑셀 원래", "Excel original"],
   Lost: ["못 얹은 고침", "Not re-applied"],
+  Linked: ["연결", "Linked"],
+  Cut: ["끊음", "Unlinked"],
+  Unlink: ["연결 끊기", "Unlink"],
+  Relink: ["다시 잇기", "Relink"],
+  AskUnlink: [
+    "이 기초를 이 단가산출 안 사본으로 굳힘 — 끊은 뒤 원본(M01) 바뀜은 따라오지 않음 (금액은 그대로)",
+    "Freeze this basis as a copy inside this item — later source changes will not follow (amount unchanged)",
+  ],
+  AskRelink: [
+    "이 기초에서 고친 것을 버리고 원본(M01)을 따라감으로 돌아감",
+    "Discard edits to this basis and follow the source again",
+  ],
+  KeptCut: ["끊은 기초 {n} 는 줄 그대로 · 자원 단가만", "Unlinked {n}: prices only"],
 } as const satisfies Record<string, readonly [string, string]>;
 const t = (k: keyof typeof TEXT, n = ""): string =>
   (TEXT[k][currentLanguageIndex as 0 | 1] ?? TEXT[k][0]).replace("{n}", n);
@@ -50,6 +66,7 @@ interface CopyReply {
   후: Record<string, number> | null;
   바뀐자원?: unknown[];
   못얹은?: { cid: string; 까닭: string }[];
+  끊은기초?: string[];
 }
 
 export interface SkEquationOptions {
@@ -72,6 +89,14 @@ export function createSangeunEquation(opt: SkEquationOptions) {
   const bar = el("div", { attrs: { "data-sk-copy": "" } });
   let last: SkEquationDraw | null = null;
   const doc = (): SkDoc => last?.doc ?? ({} as SkDoc);
+  const added = (k: number): Record<string, unknown> | undefined =>
+    doc().더한줄?.[k] as Record<string, unknown> | undefined;
+  const post = <T>(path: string, body: unknown, signal?: AbortSignal) =>
+    call<T>(`/layers/${layer}/sangeun/${path}${q}`, {
+      method: "POST",
+      body: JSON.stringify(body),
+      signal,
+    });
   /** 고침 = 저장되는 SK 만(일위대가 줄 모달 `줄모드` = 보기만 — 줄로 못 옮김) · 처음 그릴 때 정함 */
   const make = (d: SkEquationDraw) =>
     createLabEquation({
@@ -79,6 +104,7 @@ export function createSangeunEquation(opt: SkEquationOptions) {
       blocked: () => false,
       onSaved: () => undefined,
       page: {
+        sum: blockHooks,
         ask: (suffix, body, signal) =>
           call(`/layers/${layer}/sangeun/equation${suffix}${q}`, {
             method: "POST",
@@ -96,6 +122,7 @@ export function createSangeunEquation(opt: SkEquationOptions) {
       },
     });
   let lab: ReturnType<typeof make> | null = null;
+  const NO_ROW = { 입력: [] } as unknown as LogicRow; // 끊은 기초 옵션 칸 = 안 그림
   const root = el("div", { attrs: { "data-sk-equation": "" }, children: [bar] });
 
   async function job(how: "price" | "regen"): Promise<void> {
@@ -107,9 +134,11 @@ export function createSangeunEquation(opt: SkEquationOptions) {
       doc()[JOB] = got.문서[JOB];
       const sum = (v: Record<string, number> | null): string => formatMoney(v?.계 ?? 0);
       const lost = got.못얹은 ?? [];
+      const kept = got.끊은기초 ?? [];
       showToast(
         `${t(how === "price" ? "Price" : "Regen")} ${sum(got.전)} → ${sum(got.후)}` +
-          (lost.length ? ` · ${t("Lost")} ${lost.map((x) => x.cid).join(" · ")}` : ""),
+          (lost.length ? ` · ${t("Lost")} ${lost.map((x) => x.cid).join(" · ")}` : "") +
+          (kept.length ? ` · ${t("KeptCut", kept.join(" · "))}` : ""),
         lost.length ? "warning" : "success",
       );
       opt.touch();
@@ -118,6 +147,90 @@ export function createSangeunEquation(opt: SkEquationOptions) {
     }
   }
 
+  /** 더한 기초 연결 끊기 · 다시 잇기(796-2e) — 서버가 고친 그 더한줄만 화면 문서에 끼움 */
+  async function link(k: number, how: "unlink" | "relink"): Promise<void> {
+    const ask = t(how === "unlink" ? "AskUnlink" : "AskRelink");
+    if (!(await showConfirmDialog(ask, t(how === "unlink" ? "Unlink" : "Relink")))) return;
+    try {
+      const got = await post<CopyReply>(`block/${how}`, { 문서: doc(), 차례: k });
+      const one = got.문서.더한줄?.[k];
+      const list = doc().더한줄;
+      if (!one || !list) return;
+      list[k] = one;
+      blocks.delete(k);
+      showToast(
+        `${t(how === "unlink" ? "Unlink" : "Relink")} ${formatMoney(got.전?.계 ?? 0)} → ${formatMoney(got.후?.계 ?? 0)}`,
+        "success",
+      );
+      opt.touch();
+    } catch (error) {
+      showToast(error instanceof Error ? error.message : String(error), "error");
+    }
+  }
+
+  /** 끊은 기초 속 수식 — 기초마다 한 부품(다시 그려도 고르던 줄 · 쓰던 글 그대로) */
+  const blocks = new Map<number, ReturnType<typeof make>>();
+  function blockLab(k: number): ReturnType<typeof make> {
+    let got = blocks.get(k);
+    if (got) return got;
+    got = createLabEquation({
+      admin: true,
+      blocked: () => false,
+      onSaved: () => undefined,
+      page: {
+        ask: (suffix, body, signal) =>
+          post(`equation${suffix}`, { ...body, 문서: doc(), 블록: k }, signal),
+        edits: () => (added(k)?.[KEY] as EqEdit[] | undefined) ?? [],
+        keep: (edits) => {
+          const one = added(k);
+          if (!one) return;
+          if (edits.length) one[KEY] = edits;
+          else delete one[KEY];
+          opt.touch();
+        },
+        values: () => (added(k)?.입력값 as Record<string, string> | undefined) ?? {},
+        setValue: () => undefined,
+      },
+    });
+    blocks.set(k, got);
+    return got;
+  }
+
+  const blockHooks: EqSumHooks = {
+    head: (r: EqSumRow): HTMLElement[] => {
+      const k = r.블록;
+      if (k === undefined || !r.나무) return [];
+      const out: HTMLElement[] = [
+        createBadge(t(r.끊음 ? "Cut" : "Linked"), r.끊음 ? "warning" : "neutral", { size: 18 }),
+      ];
+      if (opt.edit && doc().줄모드 !== true)
+        out.push(
+          createButton({
+            label: t(r.끊음 ? "Relink" : "Unlink"),
+            variant: "ghost",
+            size: 22,
+            onClick: () => void link(k, r.끊음 ? "relink" : "unlink"),
+          }),
+        );
+      return out;
+    },
+    body: (r: EqSumRow): HTMLElement | null => {
+      const k = r.블록;
+      const one = k === undefined ? undefined : added(k);
+      if (k === undefined || !r.끊음 || !one || !opt.edit || doc().줄모드 === true) return null;
+      const version = JSON.stringify([
+        one.끊음 && (one.끊음 as { 시점?: string }).시점,
+        one.입력값,
+        one.수량,
+        doc().입력값,
+        last?.values,
+      ]);
+      const part = blockLab(k);
+      part.draw(`${String(doc().키 ?? "")}#${k}`, version, NO_ROW);
+      return part.root;
+    },
+  };
+
   function drawBar(d: SkEquationDraw): void {
     const ans = d.ans as Answer | null;
     const mark = ans?.사본;
diff --git a/resources/tester/test_799_1_subtotals.py b/resources/tester/test_799_1_subtotals.py
index 792ac1fda..83870dfa7 100644
--- a/resources/tester/test_799_1_subtotals.py
+++ b/resources/tester/test_799_1_subtotals.py
@@ -99,4 +99,4 @@ def test_화면_부품이_서버_칸을_읽음():
     for name in ("노무비", "재료비", "경비", "끝수", "합계", "자원", "덧줄"):
         assert name in ts
     line = Path("M01_MasterData/M01_MasterData_UI_LogicLab_Equation.ts").read_text(encoding="utf-8")
-    assert "createEqSum(eq, open)" in line
+    assert "createEqSum(eq, open" in line  # 796-2e 덧단추 자리 인자가 뒤에 붙음
diff --git a/ui_template/ui_template_equation.ts b/ui_template/ui_template_equation.ts
index d670473c8..e06283f2e 100644
--- a/ui_template/ui_template_equation.ts
+++ b/ui_template/ui_template_equation.ts
@@ -65,6 +65,16 @@ export interface EqSumRow {
   밖금액?: unknown;
   /** 더한 기초의 수식(접힘 블록) */
   나무?: EqTree | null;
+  /** 더한 기초 차례(M02 SK 더한줄 · 연결 끊기 796-2e) */
+  블록?: number;
+  /** 연결을 끊은 기초(이 SK 안 자기 사본) */
+  끊음?: boolean;
+}
+
+/** 소계 표 덧단추 자리(796-2e) — 페이지가 줄 머리 단추 · 접힘 블록 속을 바꿔 끼움 */
+export interface EqSumHooks {
+  head?: (row: EqSumRow, at: number) => HTMLElement[];
+  body?: (row: EqSumRow, at: number) => HTMLElement | null;
 }
 
 /** 로직 하나의 수식(줄 · 변수표 · 합계 · 소계) */
diff --git a/ui_template/ui_template_equation_sum.ts b/ui_template/ui_template_equation_sum.ts
index 4441cde14..cadeab3e4 100644
--- a/ui_template/ui_template_equation_sum.ts
+++ b/ui_template/ui_template_equation_sum.ts
@@ -4,12 +4,13 @@
  *   표 = 줄(하위 로직 블록마다 한 줄 · 자기 자원 · 덧줄) × 노무비 · 재료비 · 경비 · 계 → 합계(엔진 비목 합) → 끝수(합계 − 줄 합)
  *   값 = 서버 `소계`(M01 `master_equation.subtotals` · M02 `M02_Sangeun_Equation_Full` = SK 셈 답) · 끝수가 0 이면 줄을 안 그림 · 소계가 없으면(결과 로직) 아무것도 안 그림
  *   M02 SK 줄 = 상태 알약(더함 · 덮음 · 뺌) · 덮음 갈래 · 원래 금액 · 수량 · 더한 기초는 접힘 수식 블록 · 뺌 = 흐리게 · 금액 0
- *   쓰는 법 = `createEqSum(tree, open?)` → 요소 | null — 줄 이음(`createEqChain`) 아래에 붙임 · `open` = 펼친 블록 이름표 모음
+ *   쓰는 법 = `createEqSum(tree, open?, hooks?)` → 요소 | null — 줄 이음(`createEqChain`) 아래에 붙임 · `open` = 펼친 블록 이름표 모음 ·
+ *             `hooks` = 페이지가 더한 기초 줄 머리 단추(`head`) · 접힘 속(`body`)을 바꿔 끼움(796-2e 연결 끊기)
  * ========================================================================== */
 
 import { createBadge, type BadgeTone } from "./ui_template_badge";
 import { createButton } from "./ui_template_button";
-import { eqText, type EqSumRow, type EqTree } from "./ui_template_equation";
+import { eqText, type EqSumHooks, type EqSumRow, type EqTree } from "./ui_template_equation";
 import { createEqChain } from "./ui_template_equation_line";
 
 const COLS = ["노무비", "재료비", "경비", "계"] as const;
@@ -40,7 +41,7 @@ function row(kind: string, name: string, get: (k: (typeof COLS)[number]) => unkn
 }
 
 /** M02 SK 줄 하나 — 이름 + 알약 + 원래 · 수량 / 더한 기초는 접힘 수식 */
-function itemRow(r: EqSumRow, open: Set<string>, at: number): HTMLElement {
+function itemRow(r: EqSumRow, open: Set<string>, at: number, hooks?: EqSumHooks): HTMLElement {
   const item = node("div", "ui-eq__sum-item");
   const line = node("div", "ui-eq__sum-row");
   line.dataset.eqSumKind = r.갈래;
@@ -64,12 +65,13 @@ function itemRow(r: EqSumRow, open: Set<string>, at: number): HTMLElement {
         open.add(id);
         if (!body.childElementCount)
           body.append(
-            createEqChain(tree.줄, {
-              path: id,
-              open,
-              resultUnit: tree.결과단위,
-              numbered: false,
-            }),
+            hooks?.body?.(r, at) ??
+              createEqChain(tree.줄, {
+                path: id,
+                open,
+                resultUnit: tree.결과단위,
+                numbered: false,
+              }),
           );
       } else open.delete(id);
       item.dataset.open = on ? "1" : "";
@@ -82,6 +84,7 @@ function itemRow(r: EqSumRow, open: Set<string>, at: number): HTMLElement {
     const detail = r.덮개?.length ? ` · ${r.덮개.join(" · ")}` : "";
     name.append(createBadge(`${r.상태}${detail}`, TONE[r.상태] ?? "neutral", { size: 18 }));
   }
+  name.append(...(hooks?.head?.(r, at) ?? []));
   if (r.합밖) {
     name.append(createBadge("합 밖", "neutral", { size: 18 }));
     line.dataset.eqSumOut = "1";
@@ -105,6 +108,7 @@ function itemRow(r: EqSumRow, open: Set<string>, at: number): HTMLElement {
 export function createEqSum(
   tree: Pick<EqTree, "합계" | "소계" | "답까닭">,
   open: Set<string> = new Set(),
+  hooks?: EqSumHooks,
 ): HTMLElement | null {
   const sub = tree.소계;
   if (!sub?.줄.length) return null;
@@ -115,7 +119,7 @@ export function createEqSum(
   for (const k of COLS) head.append(node("span", "ui-eq__sum-cell", k));
   box.append(head);
   sub.줄.forEach((r, at) => {
-    if (r.상태) box.append(itemRow(r, open, at));
+    if (r.상태) box.append(itemRow(r, open, at, hooks));
     else
       box.append(row(r.갈래, r.이름 === r.갈래 ? (KIND[r.갈래] ?? r.이름) : r.이름, (k) => r[k]));
   });