Automatically Set a the value of a list evaluating value of another feild

I want to automatically set a same value of a entire group to 1 evaluating
value of another control which is outside group. In the following picture
if the question Section A Observed is 0 then all the list or control inside
the Basic Interviewing Skill & Techniques should be selected as 1.

https://lh3.googleusercontent.com/-La6e7kByNgY/VLYlZ_kN7oI/AAAAAAAAALA/K2Xb3qPi6rQ/s1600/2015-01-14%2B13_58_59-enketo%2B-%2Benketo%2Bwebform%2Bpreview.png