I'm confused myself. You're supposed to place it in the level. When you do this it is an instance of the same object so the same tilemap. Then you can draw on it with the same tileset as before. At the moment you're just clicking on it on the right side? It doesn't show up by clicking on it, you have to place it in the level. When you place the tilemap in level 1 you are creating instance 1, when you place the tilemap in level 2 you are creating instance 2, of the same object. You can draw on them separately in each layout. You don't for example need to create a second tilemap object.