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With optgroup

HTML
<div class="row">
    <div class="col-sm-5">
        <select name="from" id="optgroup" class="form-control" size="8" multiple="multiple">
            <optgroup label="Swedish Cars">
                <option value="volvo">Volvo</option>
                <option value="saab">Saab</option>
            </optgroup>
            <optgroup label="German Cars">
                <option value="mercedes">Mercedes</option>
                <option value="audi">Audi</option>
            </optgroup>
            <option value="1">C++</option>
        </select>
    </div>
    
    <div class="col-sm-2">
        <button type="button" id="optgroup_rightAll" class="btn btn-block"><i class="glyphicon glyphicon-forward"></i></button>
        <button type="button" id="optgroup_rightSelected" class="btn btn-block"><i class="glyphicon glyphicon-chevron-right"></i></button>
        <button type="button" id="optgroup_leftSelected" class="btn btn-block"><i class="glyphicon glyphicon-chevron-left"></i></button>
        <button type="button" id="optgroup_leftAll" class="btn btn-block"><i class="glyphicon glyphicon-backward"></i></button>
    </div>
    
    <div class="col-sm-5">
        <select name="to" id="optgroup_to" class="form-control" size="8" multiple="multiple">
            <option value="1">C++</option>
        </select>
    </div>
</div>
JavaScript
<script type="text/javascript">
jQuery(document).ready(function($) {
    $("#optgroup").multiselect();
});
</script>