MM Procurement process with Shipment Process

Dear Experts, I understood the below Sales process steps and posting Invoice Document against the PO (Auto generated) created for Shipment Cost Document. And this is Sales Process steps.

Creation of Sales Order -> Creation of Outbound Delivery -> Creation of Shipment Cost -> Creation of Freight PO / Service Entry Sheet for acceptance of Services -> Post MIRO for Invoice.

Anybody please guide me on below Procurement Process?

Import Purchase Order -> Inbound Delivery -> Shipment -> Shipment Cost -> GRN -> and now need to post the Freight Vendor Invoice based on the Shipment Cost Document as we are entering the Freight Cost for the Freight Vendors while creating Shipment Cost document (and not in PO creation).