If there is no plasticity (nonlinear materials) and it is all linear elastic materials, then add a dummy load step in between the steps where there are no loads on the structure and so it can go back to the original position before adding another load.
With plasticity the above does not work since we have permanent deformations (due to yield), so the best way is to define 3 different inidividual analysis systems with their separate loads.
All the best
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