1. i've tried this before and have not had success doing this
2. i do not believe surfaces are supported, and the second part of your question would be related to the answer of 1
3. i'd recommend opening a forum post in the beta section to ask if this is new or just a fluke (i personally have not checked and would suspect this to be new functionality)
Although the answer of Jared is correct it is not the completed answer I have expected from Solid Works to provide already an year long (?!)
Wow this is an old thread.
Boyko this is something I wish SW would have implemented ages ago, I agree that it would be an extremely useful feature. It's hard to know sometimes in advance where we would like to have surface parameters or a plot. I find that adding volumes after the fact is a lottery in whether or not the software will play nicely. Most of the time even if you get it to work, something bugs out with the definition of geometry faces, and pointing to one surface in the GUI may give back results on a completely different surface.