adjust concept geometry linked to structural system

I am designing a PT parking garage that starts in structural system and uses concept to design the floor plates. I have ramps created as intermediate levels that make the column lengths in concept too short which affects the stiffness and hyperstatic reactions. 

I adjust the column height manually in concept but this get overridden on remeshing. what should I do to fix this issue? Do I need to save the concept model generated by structural systems separately, delete it from the working directory, and export results to structural systems to 'lock' the geometry?