Editing and Deleting Invoices
You can make changes to system invoices and delete invoices that are no longer valid.
Navigate to the invoice to be edited or deleted. You can find invoices under Billing > Invoices.
Click on the edit action to change details about the invoices such as the invoice date, template, or billing company.
If need to delete an invoice, you must have permission and have removed all payments from the invoice. You can't delete any invoice if there are any payments applied. You can either void the payment or refund them to the customer's cash account.
If you need to change the line item(s) or values of the invoice, go to an order on the invoice and change the line item.