How to achieve this using Global and Local Sourcing Rule

We have requirement as below for order promising for two OUs. How the Sourcing Rule should be configured to achieve this result so the correct Inv Org or Supplier is selected.

1. Operating Unit A, Inv Org A1, Inv Org A2 (Product ABC is assigned to both org)

2. Operating Unit B, Inv Org B1, Inv Org B2 (Product ABC is assigned to both org)

For order promising purpose we want to setup sourcing rule for Product ABC i.e. 

If Sales Order raised for Operating Unit A then Product ABC will be

Transfer From Inv Org A1 => Rank 1

Transfer From Inv Org A2 => Rank 2