To match a single payment to multiple invoices follow these steps:
Select the payment in the system.
Categorise the transaction as 'Sales'.
View the list of all unpaid invoices.
Select the multiple invoices that the payment covers.
To match multiple payments to a single invoice follow these steps:
Categorise each individual transaction as 'Sales'.
For each payment, select the same invoice from the unpaid list.
The invoice will track the total amount paid until the full balance is cleared.