Assigning seismic load to specific frames

Good day,

Is it possible to assign the seismic loads generated by STAAD to specific frames in my building, rather than have the program assign the loads to all frames in the direction under consideration,as is normally done? If so, how can this be achieved?

For example: In a case where I have 5 frame in my transverse direction and I only want to use the 2 end frames to carry all my seismic forces, how can I achieve this in STAAD Pro.

Regards,