If you have created a Spread Layout or even an entire Studio Magazine Design that you really like, you have the ability to pin layouts and save the design sets for future use!
Pinning Single Page Layouts
By clicking the Pin icon, you can instantly save your current spread's design as a layout for quick reference.
Accessing Pinned Layouts
Once you have clicked the Pin icon, you will then want to click on Layouts at the top right. This will take you the the Designs page.
On this screen, click on "My Designs". On this page you will choose from any spread layouts you have pinned.
Saving Design Sets
From the Export menu you are given the option to save your entire design as a Design Set.
Once you click Save as Design Set, the save menu will come up. In this step it is very important to enter "Studio Magazine" in Design Set Tags. Doing this will tag it with your other saved design sets and pull it up in the Magazine Wizard when creating a New Studio Mag.
Here is a video walkthrough.