Creating sequential numbered vouchers

[vickeybear]

I'm not sure if this is possible but is there a way to create a numbered voucher that can be filled in and saved. Then create another voucher that will keep track of the numbers? (Adding the next number) So each time a voucher gets filled out it would be automatically numbered. Does that make sense? If so, how do I do that?

[gmayor]

Various methods are shown at http://www.gmayor.com/automatic_numbering_documents.htm