Good afternoon, I’m trying to create native masses in Revit, but I haven’t been able to yet. What I’ve been able to create are dead masses that can’t clip other families, which are useless to me. I’ve attached a photo of what I’m getting. In the image, it’s selected and doesn’t have its grips. I want it with grips, like a native, in-place modeled mass. Thank you.
Hello @2018018569ZU7FK and welcome 
you can try FamilyType.ByGeometry or for void FamilyType.VoidByGeometry and insert as instance with FamilyInstance.ByPoint or coordinates etc..grips/handles is controlled by reference planes and reference lines, but this one you generate is a rough freeform and center is the geometry minpoint…without any constraint, so has to made for that