Maybe problem in this: FEMAP V10.3.
This version is too old there are few users who can repeat your problem on v10.3. Also you don’t upload example file.
But I think it is possible to make section cut in V12 and export file to V10.3 via .neu format. But I need example file to see what setting you apply in your case.
Also note than section cut work for solid elements only, for beam you can use View->Advanced Post->Beam Cross Section. Maybe problem was here.