You use external shortcuts and/or replica to design proxy tables in your model.
An external shortcut is a non-modifiable reference to an object in another model. For more information on shortcuts, see "Shortcuts"in the Shortcuts and Object Replications chapter of the Core Features Guide.
A replica is an exact copy of an object that can be updated when the original object is modified. For more information on replications, see "Replications"in the Shortcuts and Object Replications chapter of the Core Features Guide.
One interesting aspect of using replica, is that you can modify the replica code in order to make it different from the target table. A custom check verifies that replica are not used as child tables of a reference.