Click this (in the Project tab):
<img src="http://xs323.xs.to/xs323/08022/addlayout.jpg">
Be sure to name your layouts (i.e., LevelOne, LevelTwo, etc.)
To switch layouts at runtime, such as when you touch the teleporter, do this in the Event Sheet Editor:
+On collision between Player.Sprite and Teleporter.Sprite
-System: Go to layout "LevelTwo" with transition "None" lasting 0 MS