openproject/public/templates/work_packages/column_context_menu.html

<div id="columnContextMenu" class="context-menu" ng-show="opened">
  <ul class="menu">
    <li ng-click="groupBy(column.name)">
      <a href="#"><span ng-bind="I18n.t('js.work_packages.query.group_by')"/> {{column.title}}</a>
    </li>

    <li>
      <a href="#">#2</a>
    </li>

    <li>
      <a href="#">#3</a>
    </li>
  </ul>
</div>