JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" class="entityCheckboxHeader1" id="entityCheckboxHeader" name="Company">Company
 <input class="modalEntityCompany" id="entity1" type="checkbox" name="CompanySub">Microsoft
 <input class="modalEntity" id="entity2" type="checkbox" name="CompanySub">Apple
<br /> 
<input type="checkbox" class="entityCheckboxHeader2" id="entityCheckboxHeader" name="Country">Country
 <input class="modalEntity" id="entity3" type="checkbox" name="CountrySub">USA
 <input class="modalEntity" id="entity4" type="checkbox" name="CountrySub">UK

CSS

.highlight {
   background-color: yellow;
}

JavaScript

$('input[name="Company"],input[name="Country"]').click(function(){

          $(this).nextAll('input[name="'+this.name+'Sub"]').prop('checked',this.checked);

});