[Closed] "Slice a Scene Horizontally"

Hello everyone,

I’m currently trying to slice a Scene horizontally. Like making a boolean on all scene.

The project is for a 3d flat, and the idea is to slice all the walls to half of his height.

I remeber there was a modifier or somthing in 3ds max to make exactly this, but I don’t remember the details and also I’ve found nothing in Google.

Can somebody help me? Thanks