After you have added a volume surface to the Volumes Dashboard, you can add a bounded area by selecting an existing object in the drawing to define the boundary.
The bounded area is added to the Volumes Dashboard as a subentry beneath the volume surface you selected in Step 2. Click the plus sign next to the volume surface to view the volume information and properties for the bounded area.
Each volume surface and bounded area that you add to the Volumes Dashboard has a check box next to it in the Volumes Dashboard. Select the check box next to a volume item to include the item in the total volumes graph, a report, or a cut/fill table.
After you add a bounded area, you can re-select the boundary by clicking in the Boundary column of the table. You can also specify a Mid-Ordinate Distance for a bounded area's breaklines.