How can I add custom description or label in Recurring Invoice?
In Metro, to add a custom description or label (like a "Legend") in Recurring Invoices—specifically to appear above or with the Invoice Lines—you can follow these steps:
1) Go to the "Accounting" module by clicking on its icon in the main dashboard or using the application menu.
2) Inside the Accounting module, navigate to the "Customers >> Invoices."
3) This action will open the invoice for editing. 
4) Open an invoice. Now, Click on the " Action >> Recurring invoice ". Now, click on the Invoice Lines Tab.
Copy and past Legend (for Invoice Lines Label) code in the Label.
5) Now, Click on the " Confirm Recurring Process " Button.
To get more details, how can I add custom description or label in Recurring Invoice, please do contact us at support@metrogroup.solutions