How to setup eBtax by using the tax classification default at the vendor site level?

Hi,

Could anyone tell me how to setup the eBtax by using the tax classification (ie: tax rate) defaulted at the vendor site level?

For the input VAT, different vendors are entitled to pay different VAT tax rate. So we would like to default the tax rate at the vendor site level, but not sure what others are required to be setup in the tax rules to enable the tax calculation.

Thks

Frances