Answer:
In RF‑STAGES, the "permanent" loads are impressed into the system. This means that their effect is automatically included in the next construction stage. For this reason, you cannot select the loads a second time.
Instead of working with load combinations, you can also work directly with load cases. That is, a permanent LC would then be the dead load, for example. As soon as variable loads are added as "temporary" loads, the combinations can be carried out (manually) in RF‑STAGES itself and then exported for the design.
There is an interesting webinar about "Consideration of Construction Stages in RF-STAGES".
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