Grade areas of the topography, changing elevations at selected points, to develop the proposed site design.
To create a graded region, you select a toposolid, which should be exist surface in the current phase. Revit marks the original surface as demolished and makes a copy with a matching boundary. Revit marks the copy as new in the current phase.
Video: Calculate Cut and Fill Volumes
To grade topography
If you are editing the surface, Revit shape editing mode. You can add, delete, or change the elevation of points.
If you drag the new graded region, notice that the original remains. Select the original, right-click, and click Element Properties. Notice that the Phase Demolished property has the value of the current phase.