1. Select Customers. 2. Browse for the File to be imported. 3. Once the import file is chosen, click Next. 4. Review the fields (columns from import file) to ensure they are matched correctly with QuickBooks Online fields for Customers. If necessary, change the mapping of any field, and select Next. 5. Review the list and make any corrections if required, directly in the preview screen. Click on Import to finalise the file import.