Storyline 2 - 3 question banks each with 15 groups of questions - is this possible?

Hi.  Not sure how to explain this.  I have a Storyline 2 quiz that has one question bank with 15 question groups.  Each group has 3 questions.  The quiz randomly selects 1 question from each group.  Now I would like to add 2 more question banks, each with 15 questions groups with 3 question in each group.  I've added and named my question banks, but when I go to import my question groups, no choices show up.  I've pasted each set of question groups into a new scene.  Is it even possible to have multiple question banks each with multiple question groups?