Drop-Down Menus are created using two separate components; the Drop-Down Menu, and the Toolbar. Before you can create and design the Toolbar, you first need to create your drop-down menus.
To understand the logic, you have to consider the Drop-Down Menu as an actual component that is used in conjunction with the Toolbar. This is simply a group of Actions, selected from your list of available Actions that were created in the earlier stages of the application's design, assembled into a single module that is displayed in a menu tree format when the object on the Toolbar is depressed.
When creating Drop-Down Menus, you will find that the menu name is automatically assigned, in numerical succession, and is not editable. This is simply because the Drop-Down Menu's name is used only for the system to associate it when you assign it to a Toolbar Drop-Down Menu Button during the last stages of the design process.