Intermediate Tip - Grade Limits are used to limit the extent of the changes to…
Vectorworks Tip 349 – Site model – Site Modifiers (Pads and Grade Limits)
Sometimes there is confusion over the what a pad object is and what a grade limits object is in site modeling. The pad changes the site model (it is the 3D object) and the grade limit controls how much of the site is affected by the pad.