Hi MJFC,

As what @Anonymous mentioned, you'll want to create a new invoice for the remaining balance of the customer. If you want to send the details of your customer's estimate, you can create a statement.

Here's how to do it:

1. Click Create (+).
2. Click Statement.
3. Choose Balance Forward in the Statement Type.
4. Click the Statements available tab.
5. Select the customer, and then click Print or Preview.
6. Click Print.

This article is also a good reference: Turn on and use progress invoicing.

I've also added a screenshot for you below.

Reach out to us anytime if you have other questions.