After creating mass floors, create a mass floor schedule to assign usages or to analyze the design.
If you change the shape of the mass, the schedule updates to reflect the changes.
If Mass Floor does not display by default, select Show model categories in this view. For Filter list, select Architecture.
See Refine a Schedule.
The schedule displays in the drawing area. If you included the Usage field in the schedule, you can assign a usage to each mass floor in the schedule.