Hi Prasath N,
Good day.
Please check help.sap.com
For example:
Routes are determined depending on the following criteria:
1.Country and departure zone (departure zone of the shipping point)
2.Shipping conditions agreed in the sales order
3.The shipping condition is defined in shipping point determination.
4.Transportation group of the material
5.Country and transportation zone (receiving zone) of the ship-to party
it addition it might vary by weight groups as well.
I hope the information is able to help you.
Thanks.
Best Regards,
Lohyh