Thanks for joining in, @BigFootProductions. Inserting a blank line in between 2 already existing lines to add a product or service is currently unavailable in QuickBooks. 

For future reference, you'll want to create and upload your templates. Read through this article to learn more about the step-by-step process: Importing Custom Invoice Templates into QuickBooks Online. 

 Additionally. I'm encouraging you to visit our QuickBooks Online Blog site regularly to get the latest news and updates on our products and services. 

I'm just here if there's anything else that you need help with. Take care!