The best method takes a little more set/effort, but what we have done is change a toilet stall to Generic Model catagory so it can be cut. Then Create a blank Specialty Equipment (wall hosted) and nest the Generic Version up into the empty toilet stall family. This will allow the family to schedule/read correctly, but still be cuttable. We've also nested a shared family into the stalls for the toilet fixtures, and toiet accessories, so that placing the stall gets you everything you'll need. As long as the items are shared, that can be correctly scheduled, and by tabbing, selectable.