You can move multiple questions from one question bank to another. When moving multiple questions to a question banks, you will not have the option to leave a copy in the original question bank. If you want to copy your questions instead of moving them, you can copy questions individually.
In Course Navigation, click the Quizzes link.
Manage Question Banks
Click the Settings icon  and click the Manage Question Banks link .
Open Question Bank
Open the Question Bank by clicking the title of the Question Bank.
Move Multiple Questions
Click the Move Multiple Questions button.
Select questions to move  and select the destination bank . Then click the Move Questions button to move the questions to the selected bank.
Open the Question Bank you moved question(s) to and view the moved question(s).
Note: Changes to questions won't automatically update quizzes that are already using those questions unless you remove the question and re-add it.