I believe we should be able to save part of the structure using Geometry>Structure>Save substructure to perform calculations and later update the main structure.
However I notice that all columns, beams and floors etc. are converted to bars and panels when I save the substructure. Changing them back to columns and beams gives me an warning that my results are out-of-date ...
Is there a way of saving part of the structure and calculating required and provided reinforcement?