After you have copied the appropriate data into the classifications template file, you can import (upload) into Adobe data collection servers.
You do not need to download (using the export feature) your existing classification data before uploading new data. You only need to upload a new file containing the new rows of data. This method improves performance.
See General File Structure for important information about the structure and limitations of uploaded files.
See Common Classification Upload Issues for troubleshooting help.