copy question from quiz into a test bank

I have a quiz, for which I would like to copy the questions into a specific bank.  The problem is that there are multiple identical questions in the "Unfiled Questions" bank, most of which throw...

How to remove a quiz question WITHOUT deleting it from a question bank.

Every time I try to delete a question from a quiz, it gets deleted from its test bank as well.  How do I delete it from the quiz while KEEPING it in the question bank?  The quiz has pr...