Thanks. I will try the method of duplicating each question. That will be very, very time consuming though.
I tried to export the New Quiz and then import the QTI file, but it did not extract the questions from the item banks, the QTI effectively remembered the associations with the Item Banks.
Item Banks should be able to be exported as QTI files, or NQs should be able to be exported with all questions as a flat file. Being able to export questions is just a good feature to have. It can help solve problems.
It's similar to Question Banks. However, although those couldn't be exported, they could be brought into a quiz in a question group, then the quiz could be exported with all of the questions.