Let's reconsider your original 32 bar song. Mac's method would work, though it might look a little strange to you on the screen. What you'd do is give the song one repeat, put the tag after bar one, have it begin at bar 33 and end after bar 62. Then copy bars 2 through 31 and paste starting at bar 33. Leave the ending generator disabled. With respect to screen space, that's almost equivalent to doing away with the repeat and tag and simply rolling the song out to 63 bars, repeating the first 31 in the second half.
To consume less real estate, try: set the tag to jump after bar 28, to begin at bar 33 and end after bar 35. Copy/paste bars 29-31 into bar 33 et voila. Or if you want to do literally what you said, you could move the tag forward another 3 bars. Doodle with it and you'll quickly see how it works. Bonne chance.
-Ron
EDIT - oops, my post crossed Noel's. Yeah that's even easier