Business Accounts and Person Accounts are differentiated from one another in Salesforce based on Person Account Record Types.
For detailed steps on how to prepare your organization and then change your Business Accounts to Person Accounts:
Once you've completed the steps above, you should have a CSV file that contains:
Mapping any other fields in Data Loader will cause the update to fail.
Use the file you created and Data Loader to perform an update to the Account record's 'RecordTypeId' field.
Updating an existing Business Account record type Id to a Person Account record type Id effectively converts it to a Person Account. See Import Person Accounts or more details.
See also:
Setting Up Person Accounts
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