partner function in vendor master

Hi..

I am trying to configure partner function for a vendor who has different oredring adress,

Can anyone explain me the stpes / details of how to configure a Partner function for vendor so that when i give the partner function in PO the adress of the partner function should be displayed.

And secondly if i create different partner function where do i maintain the address for each partner function.

Suggestions will be rewarded..

Regards