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Welcome to the QuickBooks Community. I'll share information about importing duplicate data.ValarieA.
When you import, the file will replace and overwrite any existing information in QuickBooks Online.
For complete instruction, visit this article: Delete your data and start over in QuickBooks Online.
Also, you can export some of your lists to Excel so you can import them easily to the new company. Take a look at this article for more details: Move your lists to QuickBooks Online.
Please browse through these articles below about general matters in importing data and other related topics.
Feel free to visit the Community again if you have any clarifications or questions. I’ll get back to answer them for you. Have a great day ahead.
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