CMU and CFMF shear walls in RAM SS

I am trying to analyze a building with CMU and CFMF shear walls. The diaphragm is a metal deck with 3" of concrete supported by CFMF floor trusses. I understand that RAM SS does not design CMU and CFMF shear walls but is there a way I could at least get the design forces? How does the software determine the relative stiffness of the walls if I assume a rigid diaphragm?