RAM Concept - design strip at beam in pt slab

The top and left edges of the trapezoidal area are modeled as 5' deep x 16" wide beams that separate the high trapezoidal slab from the lower slab .  The upper and lower slabs are pt but the 5' x 16" beams are mild reinf.

Do I designate a design strip along these 5' deep beams?  If so, what do I enter for CS and MS properties for these design strips?  (I am designing the 5' deep beams by hand but want to make sure I am modeling the slabs and their supports correctly.)