If this is the grapevine that is growing all over my woodland, believe me, a little cutting will actually make it GROW!! You cannot "harm" grapevine! The only problem w/keeping grapes and other invasive weeds is that they produce suckers and/or lots of seeds and they can become difficult if not impossible to control!

flowerman
I can't comment on wild grape species common in VA - but have you seen the grapes this vine produces?
A significant percentage of many volunteer muscadine grape seedlings are nonfruiting males - not sure if that is the case for other grape species.
Additionally, not all 'wild' grapes are going to be an exceptional eating experience; other than an occasional native muscadine, most fruiting wild grapes I've encountered in KY/TN/MO are tiny little exceedingly tart things, and no amount of fertilization or pampering will push them beyond their genetic potential.
Just food for thought...

You might consider grafting your favorie grape onto the wild vine. Should do well