I have a wall that is 4x8. I want to stack two columns that are 4 in height next to it. I place one on the floor, but it seems impossible to lift a second one to go on top of it. I get a message saying there’s no room, but if an 8 height wall fits, two 4 height columns should stack.
There’s a trick you can try, put one collum, place a small ceiling square on top of it, place a small floor tile on top of that, place the second column, then delete the floor and ceiling pieces - voila!
It may work, please keep us updated!