Process called from Cases.
I have created a process that is now currently running from the record in section.
Idea is : 'Opportunity' should be allowed to be in Stage 'Closed Won' once the activity at Contracting is stage is complete . This activity can only be completed if there is an order created for the opportunity.
Now , I want to call this process from Cases . Could you please suggest how can we do it so that user does not have to run the process manually.