FINALLY be able to independently edit the layers of a composite wall/slab/roof: - to be able to give it a different status: to be demolished/created... - to be able to edit it in 3d so that each layer has its own dimension (length, width, height, or even different shape) - to be able to display or not a layer in plan/section/3d... - and many other things that reflect the way a building is constructed! THANKS !