Hi Sasikanth,
The standard functionality allows you to re-transfer Commodity Codes, not Tariff Codes.
If the Swiss Commodity Codes are really 11 digits (I have no idea about that), then you would do best to create an alternative 8-digit Numbering Scheme, referenced to the 11-digit scheme. In that way, classifying a Product with 11 digits would automatically also classify it with 8 digits in the alternative scheme, and you could re-transfer the alternative scheme to the feeder system.
Hope that helps.
Regards,
Dave