Print this post - Re: How to define multi-level hinge and rail of 3D model

Nope, a window cuts a hole following its precise outline, so a cylinder will cut a round hole in a wall.
That is not the same with an object you import as a staircase. that will cut a square hole in the floor and you will have to set a custom cutout for anything different. You can set a custom cutout for a window in a wall but that is rarely needed.

The post from dorin has a link to a manual for creating custom cutouts if you want to try that. Creating custom cutouts can be pretty confusing

A circle cutout:

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M 0.5,0.5 l 0.5,0 A 0.5,0.5 1 1,0 0,0.5 A 0.5,0.5 1 1,0 1,0.5 z

I use a lot of 12-sided shapes (dodecagon) for which the cutout is this:

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M0,0.366022099 v0.267955801 L0.133977901,0.866022099 L0.366022099,1 h0.267955801 L0.866022099,0.866022099 L1,0.633977901 v-0.267955801 L0.866022099,0.133977901 L0.633977901,0 h-0.267955801 L0.133977901,0.133977901 z

Lucky for you the mannequin imported as a window will cut a nice outline in a wall.