Working with purchase order (PO) numbers

You can assign a purchase order number (PO number) at the opportunity/quote, contract, project, ticket, task or issue, subscription, and charge and expense levels. When you assign a PO number to contracts, projects, tickets, or tasks, the associated billing items inherit the entity's PO number. When you assign a PO number to a quote (do this on the Terms tab), and then close the associated opportunity using the Won Opportunity Wizard, any ticket, contract, or project charges created during the Won Opportunity Wizard will inherit the PO number.