O menu de categorias está do topo está no arquivo:
catalog/view/theme/SEU_TEMA/template/common/header.tpl
Abaixo segue um exemplo de como alterar:
Código: Selecionar todos<?php if ($categories) { ?>
<div class="container">
<nav id="menu" class="navbar">
<div class="navbar-header"><span id="category" class="visible-xs"><?php echo $text_category; ?></span>
<button type="button" class="btn btn-navbar navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse"><i class="fa fa-bars"></i></button>
</div>
<div class="collapse navbar-collapse navbar-ex1-collapse">
<ul class="nav navbar-nav">
<?php foreach ($categories as $category) { ?>
<?php if ($category['children']) { ?>
<?php if ($filter_data < 1) { ?>
<?php } else { ?>
<li class="dropdown"><a href="<?php echo $category['href']; ?>" class="dropdown-toggle" data-toggle="dropdown"><?php echo $category['name']; ?>
<?php } ?>
</a>
<div class="dropdown-menu">
<div class="dropdown-inner">
<?php foreach (array_chunk($category['children'], ceil(count($category['children']) / $category['column'])) as $children) { ?>
<ul class="list-unstyled">
<?php foreach ($children as $child) { ?>
<li><a href="<?php echo $child['href']; ?>"><?php echo $child['name']; ?></a></li>
<?php } ?>
</ul>
<?php } ?>
</div>
<a href="<?php echo $category['href']; ?>" class="see-all"><?php echo $text_all; ?> <?php echo $category['name']; ?></a> </div>
</li>
<?php } else { ?>
<li><a href="<?php echo $category['href']; ?>"><?php echo $category['name']; ?></a></li>
<?php } ?>
<?php } ?>
<li><a href="SEU_LINK"><Nome do LINK</a></li>
</ul>
</div>
</nav>
</div>
<?php } ?>
Observe que antes de </ul> inseri uma nova <li></li> com o exemplo.
Observação: Postou na seção incorreta, logo os admins irão mover para o local correto.