Hi there, @Geoff Rogers.
Thanks for posting your concern today. I'll provide some insight and steps on how you can add a discount per line item in QuickBooks Online (QBO).
Yes, you can apply a discount with fixed prices to your estimates or invoices. However, please note that you can only use this method for whole amounts, not percentages. To achieve this, you can add it as a line item to your sales forms that include a description of what the discount is for.
Let's start by creating a discount item:
- Go to Settings ⚙ and then Products and Services.
- Click the New button, then select Non-stock or Service for the type.
- Enter the name “Discount” in the Name field. If you want to create multiple discount items, give each discount a unique name so they're easy to tell apart.
- In the Sales price/rate section, enter the discount as a negative amount. Keep in mind that this is an amount and not a percentage.
- From the Income account ▼dropdown menu, choose the Discounts given account that QuickBooks created when you turned on the discount setting.
- Select an appropriate tax rate so that the discount is nontaxable.
- Once done, select Save and close.

After that, you can now proceed to add the discount item to your sales form. Here's how:
- Click the + New button, then select Invoice, Estimate, or Sales receipt.
- Add your products or services in the Product/Service column.
- Then, add the discount item you just created in the Product/Service column. You can adjust the discount if you need to, just make sure it's a negative amount.
- Fill out the necessary details of the form.
- Select Save and send or Save and close when you're ready.
Here's a sample screenshot of what it looks like after adding a discount to your sales forms:

For more information about this process, please refer to this article: Add a discount to an invoice or sales receipt.
Additionally, you can personalise the appearance by adding specific info that matters most to your business to your sales forms. Feel free to check out this article to learn more about the process: Customise invoices, estimates, and sales receipts in QuickBooks Online.
Please let me know how it goes after performing the steps above. I'm just a post away if you have any other concerns besides adding a discount to your sales forms in QBO. Have a great day ahead!
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