When creating an invoice for a service contract payment, you can include more than one payment term of the same contract.
The process to create the invoice is the same as before: either from the Payments tab in the Contract details view, the Accounts > Clients page, or the Billing > Invoices page.
Check out this article for more details.
In the invoice creation modal, you will see the following additional options:
A plus icon below the row for the next term to add more terms from the contract.
A dropdown next to the payment term to select from the various payment terms.
A minus icon to delete any payment term.