Approval levels for Return Orders

Hello

Please advise on the best way to define approval level for Transaction Types.

Example :

We want to define Approval for the Return Order Type so that the WF is only kick off once approved.

HOWEVER, we want to define different level :

if Order Value is between 0 - 1000 USD : approved by Approver A

if Order Value is between 1001 - 5000USD : approved by Approver B

etc...

Thanks