Manual way to change checkboxes, or when disabling checkboxes, set checkboxes to false/unchecked

I'm currently using a checkbox (A) which, when clicked, would "disable" a panel (B) of other checkboxes.

For this, it would be useful to be able to set all the checkboxes in panel B to false/unchecked when B is disabled. Right now, when I disable B, all the checkboxes in B stay checked. Thus, when B is re-enabled, I would have to manually uncheck the boxes for them to "reset".

My apologies if there's already a feature that does this somewhere that I've missed - I'd appreciate any help! (Also, let me know if this wasn't a clear enough explanation - I can provide further clarification or screenshots if needed).