Instead of cutting a hole all the way through the grade mesh, use slabs on the X Site Cutting layer to subtract material to the proper depth.
Location: 01 General : 3 Drawing Tools.
To use in conjunction with grade cutting with SEOs. A U- shaped white stripe which masks the bottom and sides of the mesh in the section. The right end height is the height of the object, and the left-end height is set with an editing hotspot.