Thank you all, I'll try more setup on the DXF-DWG Translation then perhaps I'll get the idea
Got this at the back of my mind: because Layout Navigator enables scaled placement, and with pdf expansion, why then there is not a straight forward feature of drawing placement (e.g re-using drawings or integrating scaled scanned-in sketches).
Link: I never hear (erm:read) anything like this (I googled for a couple of days before giving up and ask for help) so I don't know if they either new ArchiCAD user or previously AutoCAD user
I choose to try what's currently on offer, as anyone is a new user when whatever next version is published