We can use the selection screen of COOIS (with operation option) using the work center (WC) as selection criteria.
The result is list of all operations defined for the order selected by the selection screen with the criteria of WC on the operation level.
But, we want to present only those operations related to the chosen work center. We can filter the content of the entire list and define the filtered layout as variant. But I expect the SAP may supply a tool to retrieve and present list of operation by WC in a straight and simple way as we handle PM orders with IW37.
I will be happy to get the answer because I am sure that PP orders and operations can be retrieved and maintained like the PM orders.