When opening a .DWG file in ArchiCAD that has embedded blocks, you should get a dialog box that allows you to save AutoCAD blocks as GDL objects. You can also set this as a default in a custom DWG Translator setting.
David Larrew, AIA, GDLA, GSRC
Architectural Technology Specialist
a r c h i S O L U T I O N S
WIN7-10/ OSX 10.15.7
AC 5.1-25 USA