You can save your self the trouble if you make a little change to the section,elevation, or interior mark. Open the tool and then look for the portion about uncut elements. Under fill uncut surfaces with: Select nothing. The cover fills will not be made and then of course they won't export to autocad and cover some of the linework. In archicad, everything looks and works the same as if decided to fill the surfaces. I haven't tested with vector shadows or hatching but I imagine they have some masking fills.
Many Thanks, JP
John Peterson, AIA
Dalgliesh Gilpin Paxton Architects
Archicad 7-21 US
PC and iMac