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W.Salaam, For Dual Systems, frames of dual system are required to resist at-least 25% of the total base shear. This ensures that system has sufficient redundancy to justify the higher R value associated/ used with Dual Systems. There are different way to do it. You can make a copy of your model (or do save as; whichever is more convenient). Assign stiffness modifiers to walls so that they would be taking gravity load only and analyse your model for 25% of total base shear. They other way would be to remove wall panels and just leave the boundary elements and analyse your model. Thanks.