At my work I often get the question how to make an opening in different objects.
For system families you can use different methods, but for structural framing it's not possible to make en opening with a model in place family.
if you want to create an opening in a beam that does not go through the entire beam, you need to use another hosted family.
It would be so much easier if all objects in Revit would be able to be cut by a model in place family.