adding time screwed up my project

So I'm working on a music bed for a 60 second video promo for Dustball Rally (fast cars traveling cross-country).
I really want it to be exactly 60 seconds in case it ever goes to TV.
The piece was only 50 seconds so I added 10 seconds on the head so I could do some vamping with soundscapes....oops... I didn't realize at the time that would screw up my whole damn PRV.
I've put a lot of work into that 10 seconds that I don't want to re-do ...I'd like to get everything lined up in PRV again...any suggestions or will I just have to go back and ...well...you know
Thanks very much,
Randy

WRT bus and track plugs. In X1, you can save the old project (deleting all content) as a "temp project". Then using the browser, drag it into the new (completely empty of track and buses) project. I've not done that but in theory it should work too.

That could word too. Just remember to take into consideration markers. 

On a one minute project, probably not too much trouble. But a longer project markers act weird (at times) for me when deleting or adding measure (not consistent IIRC).