3D snapping has improved a lot in Vectorworks 2010, and it is easy to find…
podcast 122 – Elevation Maker for Vectorworks 2010
http://www.vectordepot.com/market/vm-040-elevation-maker-2010.html
This movie is an advert for my Elevation Maker for Vectorworks 2010 available at the above web site. This movie shows you how to use it.