Thanks for following this thread, @TKTrident. 

Thank you for showing the easiest workaround to create the Project name show up on the invoice template.

The specific functionality that you're asking for is currently unavailable. I'll do my best to keep up with your request and make sure our Developer gets your feature request ideas. 

I'd also suggest you leave feedback for them through this link: QuickBooks Online Feature Requests. Or send your idea within your QuickBooks by clicking the Gear icon and then choose Feedback.

Let me know if you have more questions. I'd be happy to offer additional help.