I solved my issue. I was actually doing a mistake. The appropriate way to subtract or add something from or to a slab or wall is using the different AEC commands:
- Create Wall Projection
- Create Wall Recess
- Add 3D Object from Slab
- Subtract 3D Object From Slab
When one does it this way then there is no problem with the Create Structural and Non Structural Groups options in a Section Viewport.
