As far as I know, there is no way to easily convert an existing quiz into a bank in a single step. There is a currently open feature request for that:
However, @Robbie_Grant offered a solution here: Quiz banks . I haven't tested that myself and so I don't know whether or not you can copy multiple banks into the same one using that process. However, if they come through in separate banks, then you can move them from one bank into another: How do I move multiple questions from one question bank to another?
If you find the whole export/import process too complicated, you could just combine all the banks into one by going back and combining them by finding them in their original locations and moving them into a common bank.
Even though you think you want everything into one bank, my experience with banks is that it's probably not a good idea to put that many items into a single bank, It makes picking the type of questions difficult and banks use pagination and the "select all" button only selects what's on the current screen. You'll have to scroll down and load more repeatedly if you have everything in one bank and then select all. When you create the content for the quizzes, you'll have to hunt down the questions in the bank, which are arranged alphabetically by question name and not by the order you put them in there. So unless every question has a consistent naming scheme starting with the chapter or unit, it's not going to be easy to find things. And because of the pagination, you'll have to keep loading more questions to find anything after the first chapter. You may have one bank that could be used for the final, but it would not be useful for each of the other quizzes.
Banks are more useful if you group them by topic and possibly type of question. A consistent naming scheme is also beneficial (like start all multiple choice questions with "mc" -- or ch01mc". So rather than creating a single bank for all of them, it would be better to create a smaller bank for each quiz with just the material on that quiz. Then you can quickly create the smaller quizzes from a bank and when it comes to the final, you just repeat the "find questions" process for each of the larger banks.
But yes, I'm recommending you just create new quizzes. Your desire to "do it once and be done with it" suggests that you're not going to be changing the questions over time. Once you get the quizzes created, you can just copy them from semester to semester and course to course. Also because although the process is repetitive, it only needs done once (or twice if you count the regular quizzes and the final). I hate repetitive tasks and will spend hours programming something that would only take me 15 minutes to do the first time, so I understand the frustration. You could have already created the new quizzes and pulled the information together in the time it's taken to research this and you still have to do the export and import of existing quizzes into question banks. And if you duplicate the questions and don't get the settings right, then you may have the questions in multiple banks, which itself can be confusing when you try to find stuff. But if you're determined to go that route, I really would encourage you to follow Robbie's advice and do it in a non-live course.
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