add additional feature and special pages

Hi.

How can I create additional featured and special pages? I have only one landing page with special and featured products.

For expample create pages like

index.php?main_page=specials2
index.php?main_page=featured2

Are you wanting more specials and featured to appear or different specials and features. The number of specials and features is controlled in the admin menu

I want different pages. For example I would like to have a campaign page for accessories, and a campaign page for monitors.

I'm still a bit foggy on what you are really trying to do. Do you have a link to a site currently doing this? Can you give us a link to the page on your site that you wish to modify? And, can you be more specific on the meaning of "campaign"?
I still believe there's something already in Zen Cart that will do what you want, but I need to better understand your terminology.

Are you wanting a specials page only listing items from the Monitors category?