Entering payments is done in one of two ways, depending if the payments are attached to invoices or not. Both methods require the same basic information, the payment date, amount, check or reference number and optionally a credit description, if the amount reflects a credit rather than a payment.
When the payments are not attached to invoices, you enter payments by selecting Billing:Payments:Sheet:
Which displays a spreadsheet like input form:
When the payments are attached to an invoice, you enter payments by selecting Billing:Payments:Open Invoices:
Where all of the open invoices for each account are shown, and you can then select an invoice and enter the payment or credit information:
Next: Posting invoices