How do I change what prints as the description on an invoice?

Product-based invoices and agreement-based invoices, including those created manually with the "Bill for coaching" button, come with standard descriptions from the system that cannot be edited.

However, when creating a manual invoice and clicking on the "+Add Line Item" button in Step 1, you can input any description, quantity (qty), and amount that you desire. Additionally, you have the option to edit invoice drafts (located at Billing > Draft Invoices). It's important to note that once you create the actual invoice from the draft, it becomes finalized and can no longer be edited. If needed, you can delete the invoice (if unpaid) and create a new one with the desired changes.