After creating mass floors, you can assign usages to them. Then you can perform various types of analysis on the design. 
Assign a usage to a mass floor using any of the following methods: 
-  Schedule: Include the Usage field in a mass floor schedule. Then assign usages within the schedule. Open the schedule, click the Usage column for a row, and enter text. If you have already entered usage values for other mass floors, you can click in the field and select a value from a list. 
 
-  Properties: To assign a value to the Usage parameter, use the Properties palette, as follows. 
 
To assign a usage to a mass floor
- In a view, select a mass floor. 
 
- In the Properties palette, for Usage, enter a value.