nested columsn inside bootstrap
<div class="container-fluid">
<div class="col-lg-12">
<div class="row">
<div class="col-sm-6">
<div class="well">
<p>First Part</p>
</div>
</div>
<div class="col-sm-6">
<div class="well">
<p>Second Part</p>
</div>
</div>
</div>
<div class="row">
<div class="col-sm-6">
<div class="well">
<div class="row">
<div class="col-md-6">
<div class="well">
<p>Nested 1</p>
</div>
</div>
<div class="col-md-6">
<div class="well">
<p>Nested 2</p>
</div>
</div>
</div>
<div class="row">
<div class="col-md-6">
<div class="well">
<p>Nested 3</p>
</div>
</div>
<div class="col-md-6">
<div class="well">
<p>Nested 4</p>
</div>
</div>
</div>
</div>
</div>
<div class="col-sm-6">
<div class="well">
<p>Fourth Part[enter image description here][1]</p>
</div>
</div>
</div>
</div>
</div>