Parametric Cell Constraints

I am working on a parametric cell that will be inserted on my bridge model in OBM, my question is how can i put an angle constraint at the bottom of my cell so i can modify the skew of the abutment, i've put my constraints on the side of the cell then extruded it sidewards, is there another way to do this? I can put the angle constraints on the bottom before extruding it upwards but then i can't modify the shape on the top which can be done by putting the constraint sidewards.

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