If you have actually received a refund then you can just create a purchase with a negative amount, and QuickFile will treat this as a credit note and ask you which bank account received the money. The only limitation of ad hoc credit notes like this is that they don’t let you hold funds on account, so you can only use them when you’ve received an actual refund.
If you create the negative invoice, this will create the bank transaction for you. You can then just remove the untagged transaction to re-balance the account.