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 imported an AutoCAD file to Archicad 10 version, I have no idea why the drawing lines from AutoCAD become "Drawing tool" when Imported it to Archicad, so that mean, lines are not editable. But it work all right in AC9 version.
I have also on occasion had it happen that when I first import the file I can't edit the lines. If I save the file, close it and then re-open it it opens up fine and fully editable.