I have a requeriment yo retrieve the cases i which i had participation, I mean no matters if the case was close by another operator or it is been working by other person, i have to show in the portal the list of cases I worked or completed a task.
You can do this by defining a report on the work history table as in the below screenshot, however you have to review the entries that are getting added to the history tables for your case types to ensure they meet your definition of participation, and filter them as necessary (Please see the OOTB decision tree FilterHistory for the list of standard work history entries Work- ID:FilterHistory, you could also filter them out in your report definition):
