Setup Issue in Third Party registration form

I Have  one operating unit ( OU1) and lets say 2 inventory org  in 2 different states like one in Karnatka and Maharastra . I have one supplier based on Karnatka who ships to me in  karnatka and Maharastra also . But in Third party organization FORM there is no option to map the supplier site with Inventory Org . Then how the taxes will get defaulted for two different inventory org for same supplier which is located  in one state . Assume that tax is getting defaulted on the basis of ITEM classification

With Regards

Priya Pusp