Cash register sales, accounting for customers with accounts

We run a village shop with cash customers and account holders. When I use cash register sales, how do I account for the customers who have settled their accounts by bank transfer ?

If you’re just putting everything through the till when they take things and recording it as payment on account then you can just treat it like card sales and create a dummy merchant bank account. When customers put something on their account you treat it as a payment into this “bank” account, when they settle up you tag it as a transfer from the merchant account into your current account.

If you’re recording account sales separately and not putting them through the till at point of sale then you’d raise a separate invoice in QuickFile for each customer and log their bank transfer as a payment against that.