Adding a constraint to a multiple choice question

I have a problem with a question.
My first question is a multiple choice question.
Question A: Do you have any items that were not available at all.
Answer choices:
A B C D E F G H

Question B (also multiple choice): Which of these missing items meet the needs of the population.
If the person chooses: A F, H, let only these choices appear and the person.

Why the second question, the person can choose 3 choices but at the first question but retain only 2 the most important for example at the second.

Does anyone have an idea of how to make the xlsform of the second question

Thanks

@Karimzak, maybe this post discussed previously should help you solve your issue:

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Thank you for your feedback.
It solves my problem

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