Conditionally display quiz questions

For simplicity, I suggest first showing the set of questions that everyone has to answer. On the last question in that set, use conditional triggers to steer the learner to the appropriate questions.

For example, on the button(s) to advance (e.g., the Continue buttons on the Correct and Incorrect layers, if you're providing immediate feedback), there could be a trigger that jumps to the Retail question with the condition that the Retail variable = True. Similar triggers could be used for the other channels. 

On the Results slide, be sure to adjust the quiz settings so the program only scores the questions that were viewed: 

FYI: The navigation triggers could get tricky if you want to let the users review the quiz. In that case, it might actually be easier to use separate Results slides. Then you could use the Quiz Settings Options to indicate which questions are scored for that Results slide, and the program should automatically step through only those questions during a Review.