Modifying kerning groups name without losing values

Hi, I have a kerning group for V that takes the values of W. I now realise that the values of W are bit too loose for the V and I want them not to be in the same group.
Or is there another way to changes the values of the V without altering the values of the W?

The tutorial at this link should tell you how to do it. Pay particular attention to the part about Groups and the lock/unlock feature.