If someone can help me I'm trying to create a sub-menu of preference that opens right inside administrative opens access, employees and control panel inside access would have two sub menus access register and list access, follow the code.
<div class="btn-group dropdown">
<button type="button" class="btn btn-primary">Administrativo</button>
<button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown"><span class="caret"></span></button>
<ul class="dropdown-menu">
<li><a href="#">Acesso</a>
<ul class="dropdown-menu">
<li><a href="administrativo.php?link=2">Cadastrar Acesso</a></li>
<li><a href="administrativo.php?link=3">Listar Acesso</a></li>
</ul>
</li>
<li><a href="#">Funcionários</a></li>
<li><a href="#">Painel de Controle</a></li>
</ul>
</div>