How to order to perform a service

We undertake CNC Router Engraving/Cutting of the material supplied by the client.I suppose it is a servise and we charge an hourly rate. It is not a stock item. Therfor system does not allow to issue a Production Order.
But we want to issue a production order to the Router Operator to do the job.Is there another way to order to perform a service?

@jaliya like I replied on support, do inward, return via Stock Entry and directly create Production Order (not against Sales Order)

EDIT: you can also use custom fields to tag the Sales Order