Hi Sasikanth,
In the entire process, you are missing the assignment of the tariff codes to the products. Discuss with the business team and they will be able to assign the relevant tariff code to the products. It's not necessary that all 10,000 tariff codes will get used.
Once the business team has identified which product will carry what tariff code, use the program /SAPSLL/MARC_UPLOAD_R3 to complete the assignment for all products. You will have to use a specific format to complete the assignment of tariff codes to the products. The format is:
| |MANDT|MATNR(20)| WERKS|STAWN|
Hope it helps!
Shrini