If a requisitioner has access to multiple sites, they will need to select the appropriate site on the requisition. If the requisition lists Site A, then the workflow will follow the approval table for Site A. If the requisition lists Site B, then the workflow will follow the approval table for Site B.
For example, the requisitioner is an administrative assistant (Ann) in IT but has security roles authorizing her to enter requisitions for 3 sites – IT (Ivan is the Approver), HR (Harold is the Approver) and General Counsel (Greg is the approver). When Ann enters a requisition and lists the site as HR, that requisition will workflow to Harold. When Ann enters a different requisition and lists the site as General Counsel, that requisition will workflow to Greg.