Approval Hierarchy

 The problem,

Operation manager and IT manager can find a request of a LAPTOP ... Same item category with same amount going to the same level of approval so how can the system direct this request to the apporaite approver ???

Do you think i should put the department as an accounting segment to be able to differentiate between them in the approval groups and how can i do that if the charge account on the requisition come dimmed from the organization parameter directly??

Note: the requester is one level all employees are assigned to it ....