On Land

Improvement on the AC9 version to interact with the Floor Plan Cut Plane.

Turn on the 'Use Cut Plane' option.

This isn't a FPCP-comprehensive solution as you'd see with a conventional roof. It's still up to you to put the object on the first 'visible' story and show it one story up. On the story above, the object is drawn complete, with no FPCP interaction. Further, I'm not checking if the object is entirely above the FPCP; that's up to you to figure out. If the object is entirely above the plane, then it should be cut n pasted to the next story up. (If it is above the plane, it will be drawn as if uncut.)

A slabified window is easy, considering it's a window and windows are hard. Build up a few slabs of varying thicknesses and IDs and you're done.

But it's tedious to set all the thicknesses and IDs, right?

How about a module of slabs preset to the proper settings? Then it's just a matter of option-clicking and magic-wanding each part.

You can arrange the slabs so they resemble a window section to help you remember what's what. And, yes, you can call out the parts with text, too, right.

I put one of these for a 2x6 wall at 3 Resources / Modules / Window Slabify.mod. Other wall types would vary but it's a start.