Link,
Thank you for your patience. Yes, now that I followed your instructions (File>GDLObjects>Open Objects) the files opend as 3D.
If I get a whole house 3D model in DWG or DXF is there any way that I can open it in ArchiCAD that preserves the operability of the component parts (walls, windows, etc.) or am I stuck with one single object when opening a DWG/DXF 3D model?
Thank you,
John