accordion - one panel nested in some div - html

Question

How I can nested one panel in div?
Problem is when this panel nested in div is open then cannot close when I open other panel. I need this because I am going to hide few panel. The div which panels are nested I want to set on display: none.
<div class="panel-group" id="accordion1">
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a data-toggle="collapse" data-parent="#accordion1" href="#collapseOne">
Collapsible Group Item #1
</a>
</h4>
</div>
<div id="collapseOne" class="panel-collapse collapse">
<div class="panel-body">Panel 1</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a data-toggle="collapse" data-parent="#accordion1" href="#collapseTwo">
Collapsible Group Item #1
</a>
</h4>
</div>
<div id="collapseTwo" class="panel-collapse collapse">
<div class="panel-body">Panel 2</div>
</div>
</div>
<div class="divWhichIWantHide">
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a data-toggle="collapse" data-parent="#accordion1" href="#collapseThree">
Collapsible Group Item #1
</a>
</h4>
</div>
<div id="collapseThree" class="panel-collapse collapse">
<div class="panel-body">Panel 3</div>
</div>
</div>
</div>
SAMPLE

Answer 1

When wrapping a div to another div, ask yourself : in what this particular div is special ? Can this div be avoided ?
In general, when you add a div to wrap another div, lets say this :
<div class="div1">
<div class="div2"></div>
</div>
You can merge the "class" to themselves, like you must have seen with Bootstrap components :
<div class="div1 div2"></div>
Doing that, you just have to be sure properties of div1 will not alter effect of css for class div2.
here is your fixed project : Editable Bootply sample