Creating a Sub-Con PO/Req within a Work Order

Hello experts,

We are trying to setup an Operation in a Routing that will trigger to generate a sub-con Req/PO when a Production Planned Order is converted into a Work Order. How do you set this up. How will it look like when printing the relevant Work ORder to show that there is a requirement for a Req/PO to be generated? is it possible if you can send me a sample work Order. Also, how would I know the difference between a standard PO against a sub-con PO ? Would it have a different PO type shown