<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<div class="row product-listing">
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
<div class="panel panel-default">
<div class="panel-heading">
*Products Segment
</div>
<div class="panel-body nested-accordion">
<div class="row mt-10">
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
<div class="panel-group" id="level1-accordion">
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a data-toggle="collapse" data-parent="#level1-accordion" href="#plast-pro-1" class="collapsed">
<span class="accordian-arrow">
<i class="fa fa-minus-square-o" aria-hidden="true"></i>
<i class="fa fa-plus-square-o" aria-hidden="true"></i>
</span>
Level 1
</a>
</h4>
</div>
<div id="plast-pro-1" class="panel-collapse collapse">
<div class="panel-body">
<ul class="list-unstyled">
<li>
<div class="checkbox">
<label>
