any one have this issue??:
I have a slab with about 7 components; I draw a standard rectangle and create a slab , no problems, I then add another rectangle (overlapping) and select both and add surface, all works , original slab is extended.
If however I try to add another area with the same add surface workflow, it will not join onto the slab, unless its a new edge of the original slab.
note - it seems to work fine if the rectangle overlaps the original slab but will not extend an already extended piece... ie. the orange bit won't add onto the white slab bit