Can I save an Automation curve ?

I don't think so but I don't understand why you would need to?
Can't you just increase track gain via the gain knob? And/or use offset mode?

Why not simply press the llittle tab that drops the Automation to its ow little track below the audio? This then allows any sort of manipulation of the actual audio part. Its the second button on the bottom left section of the track pane. Looks like a zigzag. Unless of course I am misunderstanding the question haha!

These are all very helpful in different ways and very much appreciated.
I found the simplest method for me was to insert a (EQ) plugin that has an output Gain and made an envelope from this. The small area to be adjusted was then only three nodes in the EQ plugin. This saved me from trying to lower and adjust the extensive number of nodes in my Volume envelope, and adjusting the Track Gain (overall).
My problem arose from me having the Track Gain too low at the start of recording. I'll watch this next time.
Many thanks again.

Automation envelopes are quite good in Sonar. You can even Copy -> Paste them, which is handy for copying the envelope to a separate track. I think you can even paste them to multiple tracks.

Craig mentioned the Offset mode and Normalization. Those are also good, IMO.

One of the Feature Requests I made some time ago was a Ctrl+drag a fader (or some function like that), which would not only adjust the fader, but also the automation envelope(s) of the whole track without needing Offset mode. Quick and easy way to move the entire envelope vs having to expand the track view, select the entire clip or set of clips, then Ctrl+drag the envelope(s) to make this adjustment. The only limitation is that the fader will only move up or down to the minimum or maximum volume of the envelope. So, if you have a quick Volume automation moment where it spikes high, you may not be able to raise the fader much. 

Same with Pan and other controls. It's like temporarily switching to Offset mode and back, but you can do this an infinite number of times, having never entered Offset mode.