Use the individual volume and total excavation information to know the exact amount of soil to be removed from the toposolid modeling.
Examples:
Floors
Dimensions, the Excavation Volume on Toposolid parameter refers to the portion to be excavated from the Toposolid
You can also create schedules for those parameters:
For a toposolid being cut by another element: Toposolid Total Excavate Schedule that has the Total Excavation Volume parameter.
For an element that is cutting a toposolid: Excavate Multi-Category Schedule, and filter by the Excavation Volume.