diff --git a/packages/@o3r/design/builders/generate-css/index.ts b/packages/@o3r/design/builders/generate-css/index.ts
index c69b59352a..631c5ecdd0 100644
--- a/packages/@o3r/design/builders/generate-css/index.ts
+++ b/packages/@o3r/design/builders/generate-css/index.ts
@@ -6,13 +6,14 @@ import {
   getMetadataStyleContentUpdater,
   getMetadataTokenDefinitionRenderer,
   getSassTokenDefinitionRenderer,
+  mergeDesignTokenTemplates,
   parseDesignTokenFile,
   renderDesignTokens,
   tokenVariableNameSassRenderer
 } from '../../src/public_api';
 import type { DesignTokenGroupTemplate, DesignTokenRendererOptions, DesignTokenVariableSet, DesignTokenVariableStructure, TokenKeyRenderer } from '../../src/public_api';
 import { resolve } from 'node:path';
-import * as globby from 'globby';
+import { sync } from 'globby';
 import { EOL } from 'node:os';
 import { readFile } from 'node:fs/promises';
 
@@ -21,6 +22,9 @@ import { readFile } from 'node:fs/promises';
  * @param options
  */
 export default createBuilder<GenerateCssSchematicsSchema>(async (options, context): Promise<BuilderOutput> => {
+  const templateFilePaths = options.templateFile
+    && (typeof options.templateFile === 'string' ? [options.templateFile] : options.templateFile).map((templateFile) => resolve(context.workspaceRoot, templateFile))
+    || undefined;
   const designTokenFilePatterns = Array.isArray(options.designTokenFilePatterns) ? options.designTokenFilePatterns : [options.designTokenFilePatterns];
   const determineFileToUpdate = options.output ? () => resolve(context.workspaceRoot, options.output!) :
     (token: DesignTokenVariableStructure) => {
@@ -69,8 +73,15 @@ export default createBuilder<GenerateCssSchematicsSchema>(async (options, contex
   };
 
   const execute = async (renderDesignTokenOptions: DesignTokenRendererOptions): Promise<BuilderOutput> => {
-    const template = options.templateFile ? JSON.parse(await readFile(resolve(context.workspaceRoot, options.templateFile), { encoding: 'utf-8' })) as DesignTokenGroupTemplate : undefined;
-    const files = (await globby(designTokenFilePatterns, { cwd: context.workspaceRoot, absolute: true }));
+    let template: DesignTokenGroupTemplate | undefined;
+    if (templateFilePaths) {
+      const templateFiles = await Promise.all(
+        templateFilePaths
+          .map(async (templateFile) => JSON.parse(await readFile(templateFile, { encoding: 'utf-8' })) as DesignTokenGroupTemplate)
+      );
+      template = templateFiles.reduce((acc, cur) => mergeDesignTokenTemplates(acc, cur), {});
+    }
+    const files = sync(designTokenFilePatterns, { cwd: context.workspaceRoot, absolute: true });
 
     const inDependencies = designTokenFilePatterns
       .filter((pathName) => !pathName.startsWith('.') && !pathName.startsWith('*') && !pathName.startsWith('/'))
@@ -137,7 +148,7 @@ export default createBuilder<GenerateCssSchematicsSchema>(async (options, contex
       await import('chokidar')
         .then((chokidar) => chokidar.watch([
           ...designTokenFilePatterns.map((p) => resolve(context.workspaceRoot, p)),
-          ...(options.templateFile ? [resolve(context.workspaceRoot, options.templateFile)] : [])
+          ...(templateFilePaths || [])
         ]))
         .then((watcher) => watcher.on('all', async () => {
           const res = await executeMultiRenderer();
diff --git a/packages/@o3r/design/builders/generate-css/schema.json b/packages/@o3r/design/builders/generate-css/schema.json
index c9dabe6d9b..8efc5f54c1 100644
--- a/packages/@o3r/design/builders/generate-css/schema.json
+++ b/packages/@o3r/design/builders/generate-css/schema.json
@@ -60,8 +60,18 @@
       "description": "Determine if the process should stop in case of Token duplication"
     },
     "templateFile": {
-      "type": "string",
-      "description": "Path to a template file to apply as default configuration to a Design Token extension"
+      "description": "Path to a template file(s) to apply as default configuration to a Design Token extension. In case of multiple files, the JSON will be deeply merged in the order defined by the list.",
+      "oneOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        }
+      ]
     },
     "prefix": {
       "type": "string",
diff --git a/packages/@o3r/design/builders/generate-css/schema.ts b/packages/@o3r/design/builders/generate-css/schema.ts
index 26e89bd0f6..a3b8a15c05 100644
--- a/packages/@o3r/design/builders/generate-css/schema.ts
+++ b/packages/@o3r/design/builders/generate-css/schema.ts
@@ -51,5 +51,5 @@ export interface GenerateCssSchematicsSchema extends SchematicOptionObject {
   variableType?: 'css' | 'sass';
 
   /** Path to a template file to apply as default configuration to a Design Token extension */
-  templateFile?: string;
+  templateFile?: string | string[];
 }
diff --git a/packages/@o3r/design/src/core/design-token/parsers/design-token-template.helper.spec.ts b/packages/@o3r/design/src/core/design-token/parsers/design-token-template.helper.spec.ts
new file mode 100644
index 0000000000..01b4b57632
--- /dev/null
+++ b/packages/@o3r/design/src/core/design-token/parsers/design-token-template.helper.spec.ts
@@ -0,0 +1,60 @@
+import { mergeDesignTokenTemplates } from './design-token-template.helpers';
+import type { DesignTokenGroupTemplate } from '../..';
+
+describe('mergeDesignTokenTemplates function', () => {
+
+  it('should merge object', () => {
+    const templateA: DesignTokenGroupTemplate = {
+      field1: {
+        field2: {
+          $extensions: {
+            o3rPrivate: true
+          }
+        }
+      } as DesignTokenGroupTemplate
+    };
+
+    const templateB: DesignTokenGroupTemplate = {
+      field1: {
+        field3: {
+          $extensions: {
+            o3rPrivate: false
+          }
+        }
+      } as DesignTokenGroupTemplate
+    };
+
+    const result: any = mergeDesignTokenTemplates(templateA, templateB);
+    expect(result.field1.field2).toBeDefined();
+    expect(result.field1.field3).toBeDefined();
+    expect(result.field1.field2.$extensions.o3rPrivate).toBe(true);
+    expect(result.field1.field3.$extensions.o3rPrivate).toBe(false);
+  });
+
+  it('should override data in case on config', () => {
+    const templateA: DesignTokenGroupTemplate = {
+      field1: {
+        field2: {
+          $extensions: {
+            o3rPrivate: true
+          }
+        }
+      } as DesignTokenGroupTemplate
+    };
+
+    const templateB: DesignTokenGroupTemplate = {
+      field1: {
+        field2: {
+          $extensions: {
+            o3rPrivate: false
+          }
+        }
+      } as DesignTokenGroupTemplate
+    };
+
+    const result: any = mergeDesignTokenTemplates(templateA, templateB);
+    expect(result.field1.field2).toBeDefined();
+    expect(result.field1.field2.$extensions.o3rPrivate).toBe(false);
+  });
+
+});
diff --git a/packages/@o3r/design/src/core/design-token/parsers/design-token-template.helpers.ts b/packages/@o3r/design/src/core/design-token/parsers/design-token-template.helpers.ts
new file mode 100644
index 0000000000..faadae8205
--- /dev/null
+++ b/packages/@o3r/design/src/core/design-token/parsers/design-token-template.helpers.ts
@@ -0,0 +1,33 @@
+import type { DesignTokenGroupExtensions, DesignTokenGroupTemplate } from '../design-token-specification.interface';
+
+/**
+ * Merge TemplateB into TemplateA
+ * @param templateA
+ * @param templateB
+ */
+export const mergeDesignTokenTemplates = <
+  A extends DesignTokenGroupExtensions = DesignTokenGroupExtensions,
+  B extends DesignTokenGroupExtensions = DesignTokenGroupExtensions>
+  (templateA: DesignTokenGroupTemplate<A>, templateB: DesignTokenGroupTemplate<B>): DesignTokenGroupTemplate<A | B> => {
+
+  const entries = Object.entries(templateB);
+  const template = {
+    ...templateA,
+    ...Object.fromEntries(
+      entries
+        .filter(([key]) => key.startsWith('$'))
+    )
+  };
+
+  return entries
+    .filter(([key]) => !key.startsWith('$'))
+    .reduce((acc, [key, value]) => {
+      const node = acc[key];
+      if (node && typeof node === 'object' && typeof value === 'object') {
+        acc[key] = mergeDesignTokenTemplates(node as DesignTokenGroupTemplate<A | B>, value as DesignTokenGroupTemplate<B>);
+      } else {
+        acc[key] = value;
+      }
+      return acc;
+    }, template as DesignTokenGroupTemplate<A | B>);
+};
diff --git a/packages/@o3r/design/src/core/design-token/parsers/index.ts b/packages/@o3r/design/src/core/design-token/parsers/index.ts
index 618a3de3a7..b4e610ba69 100644
--- a/packages/@o3r/design/src/core/design-token/parsers/index.ts
+++ b/packages/@o3r/design/src/core/design-token/parsers/index.ts
@@ -1,2 +1,3 @@
 export * from './design-token-parser.interface';
 export * from './design-token.parser';
+export * from './design-token-template.helpers';
diff --git a/packages/@o3r/design/tsconfig.spec.json b/packages/@o3r/design/tsconfig.spec.json
index ffc1f54a1d..fa32740a8b 100644
--- a/packages/@o3r/design/tsconfig.spec.json
+++ b/packages/@o3r/design/tsconfig.spec.json
@@ -7,7 +7,8 @@
   },
   "include": [
     "./src/**/*.spec.ts",
-    "./schematics/**/*.spec.ts"
+    "./schematics/**/*.spec.ts",
+    "./builders/**/*.spec.ts"
   ],
   "exclude": [],
   "references": [