Submitted by vhoy on Mon, 07/22/2013 - 15:08
Click Menus to get to the Menus admin page.
Click “List links” next to the name of the menu you want to edit.
You will be taken to the Menu edit screen. Click and hold down on the crossed arrows next to the menu item you want to move.
When it is draggable, the entire row will turn yellow. Still holding the arrows, drag the menu item up or down and drop it somewhere else in the menu.
Drag it to the right to make it a child (submenu) of the item above it.