Hi josehf35,
I would make the campaign setup as follow.
Create a new category under the main category-system, that you have already built. (Using function add subcategory button).
In the new campaign category, I would choose to this:
Make active = Yes
Show in Menu = No
This way you campagin category would function like a placeholder for the products specified in this campaign, and customers would not be able to navigate your shop and find the category, unless the have a direct link from ex. newsletter.
The place all campaign products in this new category and the build a new CMS page (choose your design layout) and place this code:
{{block type="catalog/product_list" category_id="xxx" template="catalog/product/featured.phtml"}}
Change the "xxx" with your campaign category ID.
Find the ID by hovering the category og simple clicking the category in admin, the url shows the category ID then.
Let me know if this helps
-- Best regards --
Kent Christiansen | Magento Certified Solution Specialist