A paved area can be milled to remove a surface layer, this could be so as to reuse this material somewhere else in the project or to reduce the level. For this operation you need to reduce the ground by a set amount rather to a set level. Naturally the ‘Reduce’ element is perfect for this as it allows you to specify an area and how much you want to reduce the depth.
Defining a section of road, milled to a depth of 200mm with a Reduce Element.