Assuming the new fiscal year begins on 1/1, I usually enter all open invoices at 12/31 using 12/31 as date and posting to opening balance equity.  As of 1/1 they're in A/R with opening balance equity at zero.  Don't need reports at 12/31 as they are in the old company file.

I was seeking an easier solution then re-entering because there are so many invoices spanning years but seems as if it's the best way to go.  

Thanks for all your help!