How do I create a credit note

Okay thanks Folk, bit of a problem, as I have moved over from another package and wanted to issue credit notes. They belong to customers who have yet to re-order. Apart from this fault I prefer quickfile to quickbooks, easier to use and cheaper too. I have got round the problem by issuing a minus figure on an invoice and saving that, next time they order I will adjust this saved invoice.

Thanks for your help