1. If you dont want to display single category, turn the category to disable.
2. You can add a category and in Display Setting select Static Block only.
I think this is what you want.
Hi Hector, as you can read in our Support Policy, we do not answer “How do I questions”. As an exception and also because it´s an easy thing to do, we are going to help you with that.
In your admin, go to “Catalog”, “Manage Categories”, select the category you want, and then go to “Display Settings”, in “Display Mode” select “Static block only” and in “CMS Block” select what you want to display in the category.-