Hi zoe-hibbert4urbo,
Welcome! The QuickBooks Community encourages each member to share their knowledge, ask questions, participate in discussions, and we hope you'll find it a great resource.
QuickBooks Desktop and Online are separate platforms, and the data is recorded differently in each product. QuickBooks Desktop creates a file you can move, where QuickBooks Online is cloud-based and continuously updating. To move the entire Desktop file, you'd need to migrate, and that would replace the information that's there. What you can do is Export your QuickBooks Desktop data to an excel file and Import data into your QuickBooks Online account. You'll find what can be exported and imported and all the steps to complete the tasks in the included links.
When you're reviewing the articles, if you have any queries, reach out. I'm here to help. Have a wonderful evening!
