The question of how to schedule only elements from a liked model has come up a few times so I thought it would make  good post.  The first trick is to understand how to schedule items from a link, this is a simple process of checking the box in the lower corner of the schedule properties (1).

Once this has been checked there is now and option Select Information from RVT Links (2) Select “Revit Link: File Name” and add it to the fields.  Now in the Filter tab it can be set to contain part or all of the name of the linked model.