list categories and subcategories full posts

Hi There,

I would like to arrange the posts of one category like this:
Is this possible?

Thanks in advanced!

child of = xx
<ul>
	<li><span>subcategory<span>
		<ul>
			<li><span>sub-subcategory</span>
				<ul>
					<li>
						full post 1
					</li>
					<li>
						full post 2
					</li>
				</ul>
			</li>
		</ul>
	</li>
</ul>