How not to "Show All" in Portfolio

Is it possible to just show the portfolio items under each Menu section eg Icons first, rather than showing all of them.

I tried deleting the Catch all <li class="activeFilter">Show All to that below - but it still brings all the items in ?

<ul class="grid-filter" data-container="#portfolio">
							
							<li><a href="#">Icons</a></li>
							<li><a href="#">Illustrations</a></li>
							<li><a href="#">UI Elements</a></li>
							<li><a href="#">Media</a></li>
							<li><a href="#">Graphics</a></li>
						</ul><!-- .grid-filter end -->