I'm not sure I totally understand, but if your goal is to provide a spring support, with lateral resistance based on friction, then the process would be to assign a spring in the lateral directions with some large stiffness, run the analysis to establish the vertical reaction, then adjust the spring based on that vertical reaction and friction coefficients. It's not a perfect way to model friction since the spring will deflect linearly under any lateral load, where real friction supports don't deflect at all unless the force is enough to overcome the friction. To do that would require multi-linear spring analysis which does not seem worth the effort here.
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