The RFEM add-on Building Model allows you to define and manipulate a building by means of stories. The stories can be adjusted in many ways afterwards and the story slab stiffness can be selected. Information about the stories and the entire model (center of gravity, center of rigidity) is displayed in tables and graphics.
More About Building Model:
https://www.dlubal.com/en-US/products/add-ons-for-rfem-6-and-rstab-9/special-solutions/building-model
Download the free trial versions and get to know the new RFEM 6 with its add-ons: