This may be an unusual situation, but I'm working on a project along with another MEP firm, but using separate Revit projects since we work in different offices. We are designing the HVAC and lighting and they are designing the plumbing and power. Therefore, they will need our equipment placed in their model so they can provide the power. If they simply link our model into theirs, they can't connect to the equipment connectors in our equipment families. I can understand why connecting to a linked model wouldn't be possible, but how should I address this situation? Do they have to copy the equipment from our model into their model?