Hi, DaveGoodwin,

You'll want to turn on the feature and create discounts on the Product and Services page. Then, add them to your invoice by choosing the correct discount. Let me guide you with the steps.

To turn on the discount feature:

1. Click the Gear icon, then Account and Settings.
2. Select the Sales tab on the menu.
3. In the Sales form content section, select the pencil icon to edit it.
4. Select the Discount checkbox to turn it on.
5. Click Save and then Done.

To create a discount item:

1. Click the Gear icon, then Products and Services.
2. Click New to create a new item.
3. Select Non-inventory or Service for the type.
4. Name the item Discount.
5. In the Sales price/rate field, enter the discount as a negative amount. Keep in mind, this is a dollar amount and not a percentage.
6. From the Income account drop-down menu, select the Discount given account. QuickBooks creates this account for you when you turn on the discount feature.
7. From the Sales tax category drop-down menu, select Nontaxable.
8. Click Save and close.

To add the discount to an invoice:

1. Click + New.
2. Select Invoice.
3. Add products and services. Then fill out the rest of the form.
4. Add the Discount item you just created. You can adjust the discount if you need to, just make sure it's a negative amount.
5. Click Save and close.

You can also record invoice payments in several ways. For future reference, please check this article for more information: How to Record Invoice Payments in QuickBooks Online.

Let us know if there's anything else that you'd like us to help. We're always right here to assist you anytime.