diff --git a/TOOLS/resource-generator/internal/params/params.go b/TOOLS/resource-generator/internal/params/params.go
index 5461d49..4f3d65a 100644
--- a/TOOLS/resource-generator/internal/params/params.go
+++ b/TOOLS/resource-generator/internal/params/params.go
@@ -16,6 +16,7 @@ import (
 )
 
 // Merge объединяет несколько наборов параметров, убирая дубликаты по Code.
+// При совпадении Code SubParams объединяются union'ом (новые поля из modify добавляются к create).
 func Merge(sets ...[]types.Param) []types.Param {
 	seen := map[string]types.Param{}
 	for _, s := range sets {
@@ -24,8 +25,13 @@ func Merge(sets ...[]types.Param) []types.Param {
 			if key == "" {
 				continue
 			}
-			if _, ok := seen[key]; !ok {
+			if existing, ok := seen[key]; !ok {
 				seen[key] = p
+			} else if p.HasSubParams && len(p.SubParams) > 0 {
+				merged := unionSubParams(existing.SubParams, p.SubParams)
+				existing.SubParams = merged
+				existing.HasSubParams = len(merged) > 0
+				seen[key] = existing
 			}
 		}
 	}
@@ -37,6 +43,22 @@ func Merge(sets ...[]types.Param) []types.Param {
 	return out
 }
 
+// unionSubParams добавляет sub-params из extra, которых ещё нет в base (сравнение по Code).
+func unionSubParams(base, extra []types.Param) []types.Param {
+	inBase := make(map[string]struct{}, len(base))
+	for _, p := range base {
+		inBase[strings.ToLower(strings.TrimSpace(p.Code))] = struct{}{}
+	}
+	out := append([]types.Param(nil), base...)
+	for _, p := range extra {
+		if _, seen := inBase[strings.ToLower(strings.TrimSpace(p.Code))]; !seen {
+			out = append(out, p)
+		}
+	}
+	sort.Slice(out, func(i, j int) bool { return out[i].Code < out[j].Code })
+	return out
+}
+
 // AlignParamTypes выравнивает типы параметров по схеме.
 func AlignParamTypes(params []types.Param, schema []types.Param) []types.Param {
 	if len(params) == 0 || len(schema) == 0 {