Thanks a lot,
Will try it. (My expertise is quite low)

Late information:
Catia 5 does seem to have a possibility to convert colours to layers. It is required to use a Semantec export, which can be selected in the export window.

Problem: Catia 5 cannot convert layers to DXF output files. It can however convert colors to layers. For many applications it is required to convert catia files to the DWG platforms Is there in Intellicad a possibility to convert colors to layers? That would facilitate a rebuild of lost layer inform...