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in those situations, when you change the contents of pick lists invalidating certain entries you can use the Find and Replace quick action on all open incidents to replace an old value (team) with its new one. At least, if there's a mapping between old and new values.
While a manual task, this perhaps is the easiest way.
I understand. Thank you for the suggestion! It is now time to learn Find and Replace and test this out!
Many thanks! Mark.