Hello there,
I understand where you're coming from. Allow me to provide you with insights about QuickBooks Online (QBO) and QuickBooks Desktop (QBDT).
First, may I know if you're trying to sync QBO and QBDT? If so, syncing these two products is unavailable since they have their differences that emphasize the unique nature of their functionalities within their respective environments.
Moreover, if you want to migrate from QuickBooks Desktop to QuickBooks Online, visit this article for guidance: Move your QuickBooks Desktop file to QuickBooks Online.
Return to this post if you have other concerns about QBO and QBDT. The Community is always here to lend a hand.