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Currently, we're unable to import projects into QuickBooks. You can only import a customer list as a workaround. Let me guide you how.
First, import your customer list:
Then, convert your customers to sub-customer. Here's how:
Lastly, convert your sub-customers to a project.
Please see these articles for details about: Set up and create projects in QuickBooks Online and Projects FAQ.
Additionally, you can check for third-party applications that offer project conversion.
Know that you're always welcome to swing by anytime if you have other questions or concerns. Thanks for posting and an awesome week ahead.