Catalog Item Scope

Hello, I am creating a new Catalog Item that will include a workflow on the sc_req_item table.

I began building the Catalog Item by first creating a new Application such that it can be within a separate application scope.

I then noticed that I can't add my new item to the existing Service Catalog Categories. The Catalog Item > Category field does not return any results. I tested by creating a new Item in the Global scope and that Catalog Item > Category field does show the categories.

My question:

Do I need to create this Catalog Item and subsequent Items/Order guides in the GLOBAL scope?