Can you invoice 2 different customers under 1 project?

Hi usermelissa4,

Welcome to Community!  I can see how having the ability to add multiple invoices related to different customers would be beneficial within a project.  The QuickBooks Online projects feature is a great way to track income, expenses and profitability right from the dashboard.  I'd be happy to provide insight here!

When creating a project, it's essentially tracking all of the above mentioned, under one umbrella.  When you open your project you'll see the option to add items such as expenses, estimates, invoices and other items.  However, these forms will be directed to the customer for which the project is listed under.  Therefore, at this time you can't invoice different customers within a single project.  You may benefit from adding additional projects to track the other customers as well.  If you'd like to see this as an option in feature improvement or future updates, I recommend sending a suggestion to our Development Team.  

For your reference, here's an article for setting up and creating projects in QuickBooks Online.

If you have any other questions, please don't hesitate to reach back out.  We'd be happy to help!