The solution :
1 - Change "Opening options" about the DWG translator.
2 - Input DWG by Xref with the right DWG translator.
3 - Open the Attribute manager and replace the type of line concerned (mine is called "dessin2|Continu").
4 - You are able to organise your kind of 2D line translation to automatise the thrid step into the DWG translator.
We are able with Archicad to input DWG
Christophe - FRANCEArchicad Designer and Teacher
Archicad 15 to 27 FRA FULL
OS 11.6 Big Sur - MacBook Pro 2017 - 16Go RAM
"Quality is never an accident ; it's always the result of an intelligent effort" John Ruskin