I would suggest going into Polygon mode and heading down the Verts side. This allows you to edit on Sub-D's using your original poly mesh, and you can edit this as you can normally using the normal poly tools.
Chris (formerly R@nSiD)
When the power of love overcomes the love of power the world will truely know peace - Jimmy Hendrix
Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)