How to include miscellaneous information on invoices?

If you want to include any extra information on an invoice as per your client's request, such as a project number or project manager's name, you can add the text as a memo to the project and turn on the rule 'Use project memo on invoices' under the Projects > Settings > Assignment tab. You can also add a message to the invoices by entering it on the Billing Options tab. Check CORE Help Center for details.