Hi there, @tbp.llc.

Thanks for taking the time to reach out to the QuickBooks Community for support. I hope you've had a great work week. 

When you require a deposit from your customer, you can add a deposit field to their invoices. Once you enter a deposit on the invoice, it’ll reduce the total amount and calculate your customer’s balance due. Please make sure you enter it correctly so you can see it in the deposit detail report later.

To use this feature, you'll first need to turn it on. Here's how: 

1. Click on the Gear Icon, then choose Account and settings.  
2. Go to the Sales tab.  
3. In the Sales form content section, select Edit.
4. Turn on Deposit. 
5. Hit Save, then tap on Done.

Once you've turned the feature on, here's how you can add it to an invoice: 

1. Go to Get Paid & Pay or Sales, then select Invoices.
2. Find the invoice you want to add a deposit to, then click on Edit.
3. Enter the amount in the Deposit field.
4. From the Deposit to dropdown menu, choose Payments to deposit or Undeposited funds.
5. Hit Save and close.

That should do the trick. For additional details about this process check out Add a Deposit to an Invoice in QuickBooks Online. 

Please let me know if you have any questions or concerns. I'm always around to lend a hand. Have a good one!