Get Geometry from coordination model (or NWC file)

[Joe.Charpentier]

Also, this thread may be enlightening- though probably not helpful in what you want to do…

Get Elements From Linked Coordination Model

Check what this article has to say about selection carefully, specifically: In Revit, the coordination model is treated as a single item. Revit cannot distinguish individual elements within the coordination model. You cannot select items in the coordination model, nor see their properties.