1. First off create a sprite object.
2.Right click in the Animation Frames window and select Import Frames (or import sprite strip if you have one). Then import all the different tiles you want to use.
3. Make sure to set the Animation Speed to 0.
4. Drag your new sprite object in to a layout. You can then set it to show any of the different tiles you have in the animation. Just select it in the layout and change the Initial Frame to the matching frame in the animation.
5. Each instance of the object can show whatever frame you want. What I like doing for level building is putting a copy of each frame somewhere outside the layout so I can just ctrl+click to copy them where I want them. Each of the square tiles is the same object, just displaying a different frame of the animation.