Congrats on your first post in the Community. I'd be happy to give you a hand with using the Deposit feature in QuickBooks.
First, you'd need to make sure you've turned on the Deposit feature. Here's how: click the Gear icon > Account and Settings > Sales > Sales and form content section > check off Deposit. Once you've turned on the feature, you'll see an option to enter a deposit on your invoice. From here, you can now enter a discount amount which you'll have to calculate manually. I've attached a screenshot below for reference.
In case you have further questions, please make sure to share as much detail as you can so we're both on the same page. I'll be here.
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