You can clear out specific forums without clearing all the New Posts. The Games forum is one that adds up in a hurry so if it is not one you want to read through every post, you can click to the Games forum and once on the title page, go to the top left corner where it says Mark Forums Read and when you click on that you have an option to mark all posts in that forum as read. This procedure will work for other forums as well but just remember that it will mark as read all of the posts in that forum.