I'm a little confused by your question, Nick, but I'll try.
1st you create an automation envelop for a track...
next you want to raise the whole envelope up or down some Db in the mix.
There are a couple of ways...
1.
if you use the gain nob you can control the input into the FX etc... now, if you have compressors set and other fx that will be impacted by the gain staging this will modify the overall sound of the track, but if you have no FX that are impacted by gain, this would enable you to raise and lower the volume of your track without moving your envelope.
2.
Alternatively, you could lasso the envelope nodes you wish to move collectively in the envelope. Control click any one of the selected envelope nodes, then release control and press shift... this will allow you to move the whole envelop vertically without accidentally moving it horizontally. now you can move the whole envelope up and down (by dragging).
3.
You could add an FX chain plug to the end of the Pro Channel and use the output fader on that chain to modify the volume coming out of the effect.