Invoices - Mark as Paid:

To view a summary of the your invoices select the 'Mark Invoices Paid' item in the 'Invoicing' menu. This will open a form displaying the status of all invoice details (whether invoices you have created or summary details entered from other packages).
To mark an invoice as paid or as a bad debt 'double-click' the relevant line and enter the date paid or tick the 'Bad Debt?' box.

To modify the view on this form select the desired 'View Option' from the drop-down list, set the 'Sort Order' based on the relevant file and chose if you would prefer the list to be displayed in ascending or descending order.