We've decided to create our own light fixture families and make them non-hosted elements... the main reason being that about 90% of the time when we start a project, we don't have a ceiling from the architect so we can't attach the light fixtures and we don't want to have to create multiple reference planes and manage them if/when ceiling heights change. SO... with that being said, how do you create a non-hosted element that will "cut" other elements, I.E. ceilings from linked architectural models.
Thanks in advance!
Matt