You can make the beams and columns lateral and then assign the desired fixity and establish the column unbalanced moment based on the RAM Frame finite element analysis.
Otherwise I guess you could run a variation of the model without the cantilevers.
For those out there who did not realize we use zero eccentricity on columns supporting beams with cantilevers, here's a bit more info:
communities.bentley.com/.../2055.ramss-columns-faq.aspx
I'll remind the product manager that some eccentricity in those connections is desirable.