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Thanks for reaching out to us here for support, dmolson.
It would be my pleasure to help you with applying the specific project income.
In QuickBooks Online only one invoice applies to a specific project. What we need to do is to create a separate invoice to track your income.
You may want to check this article for additional details about creating projects in QBO: Set up and create projects in QuickBooks Online.
I'm also including these for your future reference:
Please get back to me if you have any other concerns.