I created and attached a custom workflow to my custom ItemType. But the workflow is not managing business process. How to start the workflow that will help to manage the business process?

Hi, I want to set a specific user in workflow history report. Consider I've Part item which have 3 states A,B and C. Usually the signoff from B->C is done by X always but I want to set it to Z in workflow history report. Can I know how it is possible…