On the left hand side of the application is a panel labeled “Catalogs”. At the bottom of this panel is a button labeled “Add Catalog”. Click this button.
A popup should appear. Here in this popup you can select the parent catalog you want to create the child in. You can also input the name and description of the catalog. Click the “Next” button when you are done.
The next screen allows you to select Stickers to describe your catalog and it’s contents. Click the button labeled “Finish” when you are done.