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Hello @Iren7,

Thank you for posting here in the Community. Allow me to step in and help you delete the previous data in QuickBooks Desktop.

You can go to the installation folder of your QuickBooks to delete the previous data. Here's the default location for the company files: C:\Users\Public\Public Documents\Intuit\QuickBooks\Company Files.

Here's how:

1. Right-click on the Start menu, then choose File Explorer.
2. Use the address field to search for the location. 
3. Delete the file.

Also, there's an option to hide company files within QuickBooks. Please follow these steps:

1. Go to the File menu.
2. Select Close Company.
3. Click the Edit List button.
4. Put a check-mark next to the company file you want to delete.
5. Click OK.

For additional reference, I've included a link you can visit to learn how to rename a QuickBooks company file: Rename your QuickBooks Desktop company file.

Fill me in if you have additional questions or concerns about managing company files in QuickBooks. I'm always here to help. Take care.