Create a custom cart Administrators with a knowledge of Jelly can customize the look and feel of service catalog carts, either globally or for specific catalog items, using our UI macro capability. About this task Note: You can configure cart layouts without scripting. Once created, a custom cart can be reused and linked to catalog items. Procedure Navigate to System UI > UI Macros. Click New to create a new macro. Fill in the details and write the script to define your custom cart. Note: Designing a custom cart requires knowledge of the Jelly expression language. For reference purposes, the default cart script appears in the list as catalog_cart_default. Click Submit. Link a cart to an itemService catalog enables you to link a cart to an item.