Reset bar numbers

[Neil50]

Is there a way to reset the bar numbers back to one, part way through a piece?  I'm putting together a medley of by copying the component songs (They're all public domain, btw).  For the first component, I could keep track of where I am by making sure the bar lines on my project corresponded to those on the printed page.  Then I added a couple of transition bars, and started entering the second component song.  It would be much easier if I could re-start the bar numbers back to one at that point.  Otherwise i have to do a bunch of arithmetic to ensure I'm in the place I think I am. I know it's not complicated arithmetic, but it's one more thing to keep track of, and I confuse easily.