Split Slabs with a line

Hi all!

I would like to split a floor with a model line. I found some examples if the floor is parallel (I mean on XY plane) but I Change the sub-elements of floor so it does not work in this case.
I would like to tell you more: in our ProjectsTopo-Surfaces were made as Floor and they have all Sub elements in different Z height. We would like to new things in the Projects so I have to demolish a part of floor. For that purpose I have to split it but it takes too much to copy it and edit boundries and replace it.

Thank you all!

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