To Delete Operations From the Surface Operations List

In Toolspace, on the Prospector tab, right-click the surface and click Properties.
In the Surface Properties dialog box, click the Definition tab.
In the Operations List, right-click the operations that you want to delete from the surface and click Remove From Definition.
You are prompted with a warning to confirm the changes that you made to the surface definition.
Click Yes to confirm the changes
The surface is rebuilt with the deleted operations excluded.