You can use a flowchart like this one to show the steps of a purchasing and procurement process.
Text in this example:
For Purchases>$500 - get proper authorization
Fill out Purchase Requisition
Complete CCPR or get PO
Ensure we have Independent Contractor Agreement, Invoice, Purchase Requisition and other documentation to controller
Complete Purchase Requisition Form
Is It an Independent Contractor?
Documents to Controller for Approval
Fill Out CCPR
Independent Contractor's Agreement filled out or on File
Obtain P.O. from Controller