Sure!
It may depend on your markup and how you are using them, but generally you would need to set the appropriate CSS 'top' attribute to 40 or 80 (or however far) you wanted to push the menu down for absolutely positioned menus.
Otherwise, you should just be able to "stack" them as expected similar to the example seen here. If you have an example of what you are trying to accomplish (perhaps based on another site) it might make it a bit easier to see exactly what you are trying to do.