You can try:
Select the walls, then go to the main menu:
Design/Complex Profiles/Merge Walls
This will merge the walls, capture their composition (cut fills) and make it a Complex profiled wall... which you can change back to your desired Cut Fill or Composite.
Hope this helps
Nando Mogollon
Director @ BuilDigital
nando@buildigital.com.au
Using, Archicad Latest AU and INT. Revit Latest (have to keep comparing notes)
More and more... IFC.js, IFCOpenShell
All things Solibri and BIMCollab