Stop multiple categories showing in the main post section

I am basically trying to set up 2 featured posts in a sense, 1 is “featured posts” and the other is “recent projects” and I have managed to stop the “featured posts” from showing up in the main post section with the code

<?php query_posts("cat=-4"); ?>

How would I stop the “recent projects” from showing up aswell? I’ve tried duplicating the code and changing the id but that didn’t work.

Any help will be much appreciated.

Terry