To Add a Command to a Pull-down or Sub-menu

From the Mac OS menu bar, click Tools menu Customize Interface (CUI) or at the Command prompt, enter cui and press Enter.
In the Customize dialog box, click Menus tab.
In the Commands list, drag a command to the menu or sub-menu which you want to add a command.
Note: If you hold the cursor over a menu or sub-menu, it will expand over a short interval of time.
Release the button on the pointer device when a menu or sub-menu is highlighted, or the desired location for the command is indicated by a horizontal line.