About model and data exchange with 3rd party solutions: Revit, Solibri, dRofus, Bluebeam, structural analysis solutions, and IFC, BCF and DXF/DWG-based exchange, etc.
I am using ArchiTerra 3 with ArchiCad 12. I have built my site using a DXF file and everything was fine, up to the point when I started putting in the road. The problem is; when the road is below grade at some points, the road does not cut into the site and it does not create slopes on its sides. But when the road is above grade it has no problem creating the slopes on its sides... So I only get slpes on the side of the road that is above the original land, but when its below, the land covers it up...