stacking doodads

I Creatures of the night doodads are stacked together. For example in part 2 the creator have places archways so close togehter they form a tunnel, a whole roof. When I try that I can only place the archways with space between the arches. I checked the map, and the creator has done nothing with those doodads.
Come to think of it, a similar "doodadstack" also exist in Cult of the damned.

Anyone know how to do this?

Place the doodads near eachother, then select one and use ctrl-numpad to move it around. (I think its control... might be shift though...)

I stacked a few doodads im my map as well..

Press shift when placing your doodads. It turns off collision. You can also select a doodad and move it around with collision off by pressing control and using the numpad keys to move it around.

additionally you can go into the object editor and remove the pathing on any doodad you'd like. if you do this you might need pathing blockers, but the other stuff you still can't have the center of doodads overlap, but with no pathing you can.