How to assign an existing model 

Use

You can assign existing models.

Procedure

...

       1.      Right-click on the object and then on Assignments.

       2.      Click on New.

       3.      Enable the New Model Option button. The model types that can be assigned to the selected model in compliance with the method are available for selection.

       4.      Select the desired model type.

       5.      Choose Continue.

       6.      Select the group in which the model is located.

       7.      Select the name of the model.

       8.      Click on Finish.

Result

The existing model is assigned.