I can't find item-wise discount.

I want to ensure this is taken care of, @Chopsticks.

Let me share some information about adding an item-wise discount to your invoice. 

Before doing so, please make sure to enable the feature. Let me show you how: 

1. Go to Settings and select Account and settings.
2. Click the Sales tab and go to the Sales form content section.
3. Tick on the Item-wise discount radio button and click Save and Done.

Then, follow these steps to create the discount item:

1. Go to the Gear > Products and Services.
2. Click New.
3. Select Non-inventory or Service for the type.
4. Enter a unique name for the discount.
5. In the Sales price/rate field, add the discount as a negative amount.
6. From the Income account drop-down menu, select the Discount given account.
7. Choose Nontaxable or Exempt from the Tax drop-down.
8. Click Save and close.

Once done, create an invoice and add another line item for the discount. Make sure to click the Add subtotal to separate each item and its discount.

For more detailed steps, you can read this article: Add a discount to an invoice or sales receipt in QuickBooks Online.

Don't hesitate to comment below if there's anything I can do to further help you apply discount on your invoice. Have a good day.