Feature manager/Structural Scenario Creation

Dear friends,

in a case study, I have 3 loads each in one axis and a total of 3 static step setups. how can I solve the simulation excluding the effect of the other 2 loads in the simulation of each "static step"?

I tried specifying each load to its own static step using Feature manager but the solver can not solve it. however, when I deactivate the other 2 static steps and solve the other, it works well.