In the Customize dialog box, click the Commands tab.
In the Categories box, click New Menu.
From the Commands box, drag New Menu over the menu you want to add the submenu to until the top-level menu drops down, and then add New Menu in the desired location.
Right-click the new submenu, and then type a name in the Name box on the shortcut menu. Press ENTER.
Complete the menu by doing the following:
Adding commands from the Customize dialog box. For more information, click .
Moving or copying commands from other menus. For more information, click .