At any time, you can update a invoice item. For example, suppose you want to change an items quantity. Just click the ``Qty'' cell and enter the new quantity amount. The totals will be automatically by updated.
To delete all items (e.g. start over), just click the ``Clear invoice items'' button. To delete just one invoice item, place the cursor on a cell in the row that you want to delete and then click the ``Delete item'' button.