The following code shows how to create Multiple button groups with dropdown as last one.
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-git2.js'></script>
<link rel="stylesheet" type="text/css"
href="http://getbootstrap.com/assets/css/docs.css">
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0-rc1/css/bootstrap.min.css">
<script type='text/javascript'
src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0-rc1/js/bootstrap.min.js"></script>
</head><!--from w w w .j a va 2 s . c om-->
<body style='margin:30px'>
<h3 id="btn-groups-toolbar">Multiple button groups</h3>
<div class="btn-group">
<button class="btn btn-default" type="button">1</button>
<button class="btn btn-default" type="button">2</button>
<button class="btn btn-default" type="button">3</button>
<button class="btn btn-default" type="button">4</button>
</div>
<div class="btn-group">
<button class="btn btn-default" type="button">5</button>
<button class="btn btn-default" type="button">6</button>
<button class="btn btn-default" type="button">7</button>
</div>
<div class="btn-group">
<button class="btn btn-default" type="button">8</button>
</div>
<div class="btn-group">
<button type="button" class="btn btn-default dropdown-toggle"
data-toggle="dropdown">
<span class="caret"></span>
</button>
</div>
</body>
</html>