These properties can be used to create the grading group and to control the surface properties of the grading group. 
If you chose not to create a dynamic surface for the grading group when you created it, use the Grading Group Properties to create this surface. You can also specify the surface to use for volume calculations. 
- In Toolspace, on the Prospector tab, expand the Site collection. 
- Expand the Grading Groups collection. Right-click the grading group you want to edit. 
- Click  to open the Grading Group Properties dialog box. 
- Change the properties on the Information tab, or click the Properties tab to review the settings, styles, criteria, and volumes for the grading group. 
- Click OK.