Maybe nobody is responding because.....your client needs to learn how to use AutoCad? Scaling is one of the more rudimentary things an AC user should know, as is exploding.....anything can be exploded, smashed to bits, purged, audited, edited....if they know this little even, you should tell them they are using the wrong software. They will have no problem editing your PLN in ArchiCad.
What specifically can they not do? Do they know what drawing units they currently work with? Do they get better results from your floorplan-exported views directly - using save as?
Andy Thomson, M.Arch, OAA, MRAICDirector
Thomson Architecture, Inc.Instructor/Lecturer, Toronto Metropolitan University Faculty of Engineering & Architectural Science
AC26/iMacPro/MPB Silicon M2Pro