Summary
In this scenario, a customer pays for a full year of monthly service but doesn't want an invoice sent each month.
Key Points
In the Work Order set the billing frequency to Yearly
Set the Next Invoice Date to be at the end of service
Update the quantity, pricing and Production Value accordingly
Create the Work Order
Set the billing frequency to Yearly with a date for Next Invoice Date to be at the end of that service (if it starts July 1 this year, enter June 30 next year)
In the line items, either:
Update the quantity to 12 with the monthly price
OR
Keep the quantity at 1 and update the price to the annual amount
Update the Production Value to the monthly amount
Check the box [x] Hide Pricing on Work Orders
Set the Services to Monthly in the Schedule Tab
Click Save
If the customer has already paid, create an independent invoice for the payment / invoice. However, next year and every year thereafter, it creates a new annual invoice.