Anyone know how to quickly level a driveway widthwise? I have a curved driveway that slopes over the length of it, which is ok, I only want to level it by width. The modifier 'level region(cut/fill)' doesn't work because it levels the entire driveway over length and width. If I do small sections at a time it will look choppy.   Also a separate question. Can I select an area to modify that already exists? like if I click on the entire driveway and want to use that shape to modify instea