vfp 3.0 win 98

Hello All,

I have a pageframe which displays a new record with an
invoice number. I now want to do an invoice number with
an A,B,C following the invoice number in a separate field.

What is the best way to make additional copies of the same
invoice go from A to B, etc. each time a new invoice is added?

Thanks and have a great day!

Becky