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 Core Features Guide > Linking and Synchronizing Models > Shortcuts and Replicas.
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 Core Features Guide > Linking and Synchronizing Models > Shortcuts and Replicas.
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.