Flipside lets you save and come back to different configurations of any given set, called setups:

Step 1. Choose a set and add a few props to it.

Step 2. Open either the Sets or Props menu.

Step 3. Click on Save As New Setup on the bottom row of the menu.

Step 4. Make some changes to the set by adding, removing, or repositioning props, or changing the sky.

Step 5. Click on Save As New Setup again to save a second configuration of your set.

If you want to update an existing setup, select that setup, make your changes, then click on Update Setup.

Next: How to load different setups of a set