Easily you can draw beams above each loaded wall and assign loads to the beam.
be careful, this beam must be either "NONE" Section or Small dimensions section like 1x1 cm2 to Ignore shear and moment strength.
For me I prefer "NONE" section Beam.
There two ways to solve your problem:
1. You can draw a spandrel between two elevations, its material is concrete with E=60%*Eco in order to consider cracks in this section (effective area becomes smaller).
2. Also you can use line constrains: first, draw the beam in one elevation connected to...
