Building up nearly anything with planbuild is not a problem.
What i meant is i build a large structure with planbuild.
Its completed, but later get damaged partially demolished.
(Like trolls raid)
Then its about to impossible to restore to its original state
I was hoping for a proper snap option where the ghost plan snaps to the existing same design (with missing build pieces)
What i figured out i can manually put the same ghost plan over the existing building and manually only build up the missing ones then delete the plan when fixed up.
The problem with this workaround is there are some pieces underneath other pieces i cannot manually add materials to is since the other pieces is blocking the possibility to select the plan piece
Thanks for the info