{loop name="category0" type="category" parent="0"}
<h2>1 - CATEGORY : #TITLE</h2>
<hr /><hr />
{loop name="category1" type="category" parent="#ID"}
<h3>2 - SUBCATEGORY : #TITLE</h3>
{/loop}
<h2>1bis - CATEGORY : #TITLE</h2>
{/loop}