Requisition Approval Process

We have a business case, that our budget and planing team needs to be included in purchasing approval hierarchy of every requisitioner to actually validiate encumbrance and budget action at every requisition. How can we embedd the our budget team into approvals of every requisitioner as one position would be allowed once and can not be replicated everytime in approval position hierarchy. Is there any setup requirement for such arrangements? or how can we achieve it?