Purchasing Approval Flow based on Supplier type

Hi Friends,

Good morning...!!

We have 2 types Suppliers 1. Internal supplier : Where we procure items from different locations in same Business group. 2 External Suppplier : Where we procure goods from outside suppplier.

How to use same position hierarchy for both suppliers with different limits?

Example:

General manager  --> Internal Supplier Approval limit : Unlimitied

                             --> External Supplier Approval limit : Unlimited

FIN Manager        --> Internal Supplier limit : USD 10000

                           -->External Supplier limit : USD 5000

Dept Manager ---> Inter supplier Limit : USD 2000

                        ---> External Supplier : USD 1500

Buyer             --> Internal supplier limit : USD 1

                       --> External Supplier Limit : USD 1

Please consider above as position hierarchy...  How to implement approval limits for 2 types suppliers (Internal and External). quick help will be greatly appreciated.