It was driving me nuts that, unlike in Flash, you can't create scenes in EA. After thinking about it for awhile, I came up with a pretty simple solution: Since you can turn anything on the stage (even video) into a symbol, and each symbol has its own timeline, just find the main item you wish to have in a "scene" and turn it into a symbol. You can then edit the symbol, including adding other items as you would a scene. Then, edit how you want it to appear in the Timeline. Problem solved! Hopefully this helps someone.