Purchase order with Freight Value

Dear All,

My scenario is....

I Purchase some material to my x vendor. when he send the material , he charge freight amount on it. now please suggest me how to create a purchase order with freight value & I want to take freight effect on every material. vendor is not divide freight amount on every material. now what will i do. If i take this effect only one material than My material map get change. How to take this effect on every material.

Regards

Vimal