Add approver based on derived approvers list

Summary:

Add approver based on derived list of approvers

Content (please ensure you mask any confidential information):

We have a requirement to add a specific approver when another specific approver appears in the list of approvers for the requisition.

The general approval method we use is Job level hierarchy. But each approver with job level 50 or more has a "secondary approver". This secondary approver (a named person) also has to approve each requisition over a certain amount. I am looking for a way to model this in BPM.

So far we created rules like IF ReqLineDimension.supervisorLevelxUsername is "John" AND ReqHeaderDmension.requisitionTotal more than 250000 THEN Listbuilder is Resource and Users = "Pete".