Questions How to make use of the Subcontract Source for "Drop Ship" in Advanced Manufacturing

Hello

How do we make use of the Subcontract Source of "Drop Ship".  Whilst the User Help refers to being able to drop ship from a supplier/previous operation to the subcontractor, I cannot find anywhere that guides you how to make use of this function.

Drop Ship: Indicates the material will be sent directly to the supplier. Drop ship material needs to be issued to the production order but there is no inventory transaction to take place. Cost and quantity from the drop ship PO will be allocated to the material line.

Does anyone know how to create the Drop Ship PO?  Attempting to create them from production order does not work.  And as far as I know, these can only be linked to Sales Orders?

Does anyone know how to execute the PO so that "Drop ship material needs to be issued to the production order but there is no inventory transaction to take place"?