Look at a concrete example:
https://sapes5.sapdevcenter.com/sap/opu/odata/IWFND/CATALOGSERVICE;v=2/ServiceCollection
Browser access, you can see all the OData service exposed by the gateway system:
We use the Create from template menu item in SAP WebIDE years, when Fiori application, this is done through catalog service by creating a new wizard. From the Service Catalog in selecting a Destination, the system will see SAP gateway point to the Destination's all exposed OData service:
For more Jerry's original article, please pay attention to the public number "Wang Zixi":