Hello, @BehindtheDesk.
I appreciate you joining this conversation and sharing the details of your concern. Allow me to jump in and provide information about adding invoices to Projects in QuickBooks Online (QBO).
As mentioned by my colleague above, editing invoices that are linked to payments will disconnect the payment. Don't worry! You can still reconnect the linked payments by following these steps:
You can refer to this article for the step-by-step process on how to add paid invoices to a project: Add existing invoices to QuickBooks Online Projects.
I'm also adding this article that tackles managing Projects in QBO: Set up and create projects in QuickBooks Online.
You can also visit our website for tips and other resources you can use in the future. QBO self-help articles.
I'm only a few clicks away if you have additional questions about Projects or anything else. I'm more than willing to help. Take care and have a good one.
