Topography to floor. Split floor problem

hello!! Hope u ar all fine.
I have to realize a huge floor (20km2) and i have topography. In this project i have some concret parts some football field, vegetation and so on. With a script i transformed the topography into a floor. I started dividing the floor to put materials but the floor s sub elements of the floor, in the point where i cut to divide it, lose their height and go back to the level of belonging. To ne clear i have: a super giant floor with the correct altimetry and a lot of small floors which is obtained by duplicating and cutting this super floor.

Is there a way on dynamo to modify thede sub elements floor and bring them from the level of belonging to the correct elevation altitude located in the super giant floor (the one i created by transforming the topography to be clear)??