Need help with Purchase requisition Approval flow

Summary:

Need help with Purchase requisition Approval flow :

Want to implement the rule ,

If the "sr director finance" is not part of approval hierarchy , then "VP -Finance" should be added to approval list , If the "sr director finance" is part of approval hierarchy , then "VP -Finance" should not be added to approval list ,

In the below sample data , i have mentioned 2 use cases ,

1. If John is raising a PR , the approval flow goes to John—> David—> Andrew , It should not add Robert (VP finance )in this case , since Sr.director (andrew) is already part of the approval hierarchy.

2. Is Tim is raising a PR , the approval flow goes to Tim—> Wood—> Samson, It should add Robert (VP finance ) in this case , since Sr.director (andrew) is Not part of the approval hierarchy.