Project based requisition should first approved by project managers followed by EmployeeSupervisor

This is for oracle Fusion procurement request where currently we are using BPM approval rules for requisitions approvals where the approval process follow the standard employee Supervisor hierarchy in the current situation.

We are also raising project based requisitions. For the project based requisitions, the requirement is to first get approved by project managers defined in the Project costing module where against each project number there will be a person assigned to project manager role. Once Project Manager approves, then it should follow the regular Employee Supervisor hierarchy.

Can someone share wither the whitepaper so that I can follow or what attribute we should configure in BPM so that it should do the follow: