How to change the orientation (local axis) of the members/plates without remodeling the structure?
First select the members or the plates for which you would like to change the local axis orientation. Then depending on the entity type (beam or plate) choose the appropriate option mentioned next:
STAAD.Pro CONNECT Edition
the option to change the beam incidence can be found in the Utilities > Beam Tools > Beam Incidence.
For changing the Plate Reference Point go to Specification > Plate > Plate Reference Point.
For beam members, select the beams first, then go to Tools > Redefine Incidence and choose an appropriate option.
For plates, go to Command > Geometric Constants > Plate Reference Point and set the reference point to which (or away from which) the local Z would point.