JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" class="entityCheckboxHeader" name="Company">Company
<div class="subCategory">
    <input type="checkbox" name="CompanySub">Microsoft
    <input type="checkbox" name="CompanySub">Apple
</div>
<input type="checkbox" class="entityCheckboxHeader" name="Country">Country
<div class="subCategory">
    <input type="checkbox" name="CountrySub">USA
    <input type="checkbox" name="CountrySub">UK
</div>

JavaScript

$(function(){
    $('.entityCheckboxHeader').click(function() {
        $(this).next().find('input').val(!$(this).val());        
    });
});