one time partner determination in sales order

Hi

I am Create a sales order on behalf of Contract (in Contract Sold to and Ship to Party is used "One Time Customer")

In Sales order We want to provide The Name and Address to One time customer . Here we have to Change each partner i.e Sold to , Ship to , Pay to Bill to party.

Requirement is When We provide the Name and address to Sold to party. The same information to be copy to other partner

Sandeep Bhatnagar