I need to raise some credit notes from suppliers and hold on account until we are ready to pay them, or deduct the amount at the end of the month.
The credits do not relate to any previous purchase invoice as the credit is for materials that have been returned from several previous jobs so cannot do against an invoice, please advise.
You can only raise credit notes to hold on account with an original paid invoice to credit note against. This completes the double entry and is needed to explain the origins of the credit note.
Presumably if goods were returned at some point a payment would have been made to that supplier.
You could however just manually enter a credit from the supplier detail screen.
Just set the payment date to before you started using QuickFile, this will drop the funds directly on the supplier account for use later.