Customizing Prebuilt Service Catalogs The Service Catalog module allows you to preview out of the box (OOB) catalogs and customize them according to their specific requirements. Navigate to the Design inventory and click Design. In the Design page window, to customize an existing page, hover your mouse over the page and click Use. A copy of the selected page opens on your screen and is added to the Design inventory. Note: For steps on designing catalogs, click here.Tip: You can also access and customize these catalogs from the Store.