Thanks for reply, yes I know about this "solution", it is also documented in Graphisofts videos, but it is still very unpractical. Working in 3D is by far the best option.
I am having a series of points (entrances, shafts etc) with fixed Z value and then applying changes in the terrain (not to get to steep terrain) and landscape elements around the house: walls, steps, driveway, ramps. They are in different position, different directions etc. I would need probably 10 sections in X and same number Y direction.
Archicad 22 on OS X 10.11.6