Connect with and learn from others in the QuickBooks Community.
You'll want to add a line item for the invoice fee. Let me guide you how.
Before doing so, let's create a Product/Service for the invoice fee. In your QuickBooks Online (QBO):
Here's an article you can read for more details: ADDING PRODUCTS AND SERVICES TO QUICKBOOKS.
Once done, let's add the invoice fee to your invoice:
Let me also add this article that can guide you on how to give a new look to your invoice: Customize invoices, estimates, and sales receipts in QuickBooks Online.
You can always post your questions anytime in the Community. Getting you back in working order is our top priority. Have a great weekend ahead!