How to Invoice Customer first and then send goods?

How to Invoice Customer first and then send goods?

Our business Invoices the customers on Day 1 and starts sending goods after a few days. All goods are not sent at the same time. Some goods are sent after 1 month and some after 3 months.
Is there a way to record how many goods are sent and how many goods are pending to be sent to the customer?
Day 1 - Invoice with 10 goods
Day 20 - 1 good is sent
Day 60 - 9 Goods are sent