Sloping Multi-Thickness Floors

[DNP]

I was wondering if anyone has any input on methods for modeling a sloped elevated concrete floor consisting of multiple thickness floor elements. The floor types are not variable, so the individual floor elements maintain their constant thicknesses in all areas. The slope lines (top and bottom of slab) from one thickness of floor (say 12”) will carry through to the adjacent thicker floors (say 18” or 24”). I’ve attached a PDF and Revit 2013 model of a slab system consisting of the following:

1) 12”, 18” and 24” thick concrete floor elements (currently set at a level elevation of 10’-0”)
2) The ridge lines (top of slab elevation = 10’-0”) are along gridlines 2 & B.
3) The perimeter slab edge also maintains a constant elevation of 10’-0”.
4) The dashed lines are the proposed valleys and intersect at the desired low points of the floor = elevation 9’-8”.
5) The low points should be relatively close to their proposed locations, but do not have to be exact.
6) The columns are attached to the floor soffit to allow for the top of column elevations to be determined by the final slope of the floor.

I’ve tried using split lines, within each individual floor type, but getting the different thicknesses to align correctly (and also join) by adjusting the floor elevation points is a task.

Is there any way to apply the split lines to the entire floor system to allow for grading of the entire floor system as a contiguous element?

Any input or suggestions would be greatly appreciated.

Thank you.