If you add a building pad to a graded surface, you will see cut and fill reported separately for the pad and the toposurface in a topography schedule.
This is because the pad divides the graded surface into 2 surfaces: one is the surface under the pad (the graded surface), and one is the surface that is not under the pad (the pad surface).
You should name both the graded surface and the pad surface to distinguish them in your schedule.
To select the surface under the pad, press Tab to highlight it, or turn off the pad's visibility. See Override Visibility and Graphic Display of Individual Elements.