However, whenever this topic comes up, we should remember that while ArchiCAD can import AutoCAD objects as described above, they in no way become "useful" GDL objects with parametric potential. We can observe the code in the 3D Script in the object dialog, but it remains cryptic - blocks and planes mostly - that do not lead to geometric [and therefore editable] understanding.
As an aside, most object maker applications create fairly useless code since they merely describe surfaces, not relationships.
Dwight Atkinson