Modeling a Composite Model Class 
You have created a query or a composite model class in the Mobile Project.
In the Laptop UI Explorer, click the query node with the secondary mouse button and choose Open Query/Composite Model Class Editor .
Choose the Properties tab.
The properties table appears, which allows you to:
Add an attribute from a model class into the composite class
Delete an existing attribute in the composite class
Note
To delete an attribute, select the attribute and choose Delete.
To add an attribute, choose Add.
Select the required attribute and choose Next.
Choose Finish.