I am building a rooftop air handling unit consisting of nine sections, each a separate family. I am then loading all of the sections into a single family to create the air handler. However, when I load the air handler into my project, none of my connectors (supply air, return air, outside air, etc.) are showing up. If I load each section into the project separately, the connectors show up. However, for scheduling purposes, I want it to act as one piece of equipment, not nine separate pieces. Is it not possible to have nested objects with connector capability?