Limiting Answers in Arrays - by: BBCMResearch

Apologies, because I'm pretty sure this has been asked and answered before - I just couldn't find the appropriate threads.

I have an array of 5 subquestions SQ1-SQ5.

I have 8 answers - a 7 point lickert scale plus N/A.

However, N/A is not a relevant answer option for SQ1-SQ4.
How do I limit my last answer option (N/A) to be selectable only in SQ5, but not in any of the other subquestions?

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