
Before you can model a query or custom operation, you need to create a service, which functions as a bundling entity for service operations.
In the Service Explorer , select the Services node of your project.
Open the context menu and choose Create Service .
In the Create New Service dialog box, enter a Name (mandatory) and a Description (optional) for the service.
In the Service editor, select the Operations tab.
Click Add to add a service.
Depending on whether you want to model a query or custom operation, in the dialog box select:
Query
Custom operation
You have created a service.
A service should contain a set of operations such as a query or a custom operation. For more information about modeling queries and custom operations refer to Modeling a Query and Modeling a Custom Operation.