You can save a "template" copy of your custom design to use as a starting point later.

When a "template" copy is saved, an exact copy of the current design you are working on is saved with the name you give it. You can select the "template" copy later to start a new design exactly as it was when you saved it.

When you are logged in, you will see a list of the your newest saved design templates as well as your currently active design on the left of your screen. Simply select the template you wish to design with.

If you wish to see all of your saved design templates, select the "Manage Designs" image at the bottom of the list of designs on the left of your screen.