Add checkboxes for the single positions at the invoice details in the invoice lines tab.
We create all of our invoices manually. Usually we don’t use the pro rata checkbox and four invoice lines for shipment, discount, overhead and insurance are created automatically.

In most cases not all invoice lines are needed and we delete the redundant lines manually. Therefore it would be easier to have a checkbox for choosing these lines and to be able to delete all of them at once instead of choosing and confirming the deletion of each line separately.