I've tempo mapped a live piece of music, but did it wrong. The down beat is happening in the metronome on beat 2. I wonder if anyone knows how to nudge the entire tempo map forward or backwards in a project. I tried cut and paste, but nothing happens.

Did you try Cut-Special and Paste-Special, remembering to highlight at the start on the Cut-Special and then move the now time marker to the new start on the Paste-Special? 

Thanks Bapu,
I tried it before and it didn't seem to work, but that was after I had zoomed in to get an accurate paste, therefore when I pasted it I didn't see any changes. This time I zoomed out and saw that it had indeed worked. At present my whole project is based on the wrong downbeat. Ideally at this point I'd like to just cut and paste the whole project (tempos and all) forward 3 beats. Who knows? maybe it will work.

Ha! just tried it. "Ctrl+A" on the whole project. Cut special. Tick the appropriate boxes. Relocate to new starting point. Paste special and Voila! Everything's where it's supposed to be.