I need help making a hole in this wall for this jail cell thing

I’m trying to make a hole in the wall in the screenshot provided in order to make space for the jail cell bars. I tried the union button but it wont work because the actual bars were made in blender and are meshes.

can someone help me :sob: im so confused ive tried so much

Couldn’t you just build the wall around the bars area?
Or make a part the size of the bars, negate that, and union it with the wall (though last time I tried unioning rectangular prism parts it messed with collision bounds, so idk if this would work)

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