I appreciate Noel's workaround, however I would still add the "bar offset" request to the BIAB Wishlist. From Daniel's original and subsequent post, I assumed he wanted to stay in BIAB, as he did not mention anything regarding wanting to "print" the song, only to re-number the bars.

In response to John-Luke's question about the "dedicated notation program", Personal Composer comes to mind. It has a "Measure Numbers" dialog box where you can turn numbering off altogether, skip the first bar, or begin numbering at any bar.

LLOYD S