Being able to use projects with different addresses under one customer has been forwarded already to your Product Team, 9130349659890896.
Since we don't hear an update on this feature, you can visit these links to keep you in the loop with what's new and coming:
For now, you can use the current feature of using projects in QuickBooks Online.
Don't hesitate to post again if you need anything else. I'll be around to help you with any QuickBooks issues you may be having.
