Drop Down Menu

Most probably yes. You have already created onw drop-down menu under: Multimedia Services >> Design

How did you do it? You have to do exactly the same method.

I suggest look at this article:

http://en.support.wordpress.com/menus/#changing-the-order-of-menu-items-and-creating-sub-menus

Also, make sure your theme supports custom menus or make sure you have the relevant plugins for menu items.

Good luck.