Linking Link item from one index to another

Site URL: http://www.joshbranton.com

Is it possible to link one clickable link from a hidden index to a live indexes page? I am using the Carson template. 

For example, I have a main index page that lists out 4 different categories, Advertising, Branding, Packaging, and Illustration. Say you click Advertising, it will take you to that index's page, which has two images that can be clicked through to view the project. both of these project pages are in an index that is not linked. I'm doing this so that I can maintain the footer with links that the index pages use in this template.

Currently the index of these non-linked pages display the links for the individual projects. I was wondering if there's a way to adjust it so the links on the non-linked indexes take you to the same page that the Linked index would take you to. 

This is the Home page index, when you click advertising, it brings you to this page (below)

The dummy on the left will clickthrough to this page, highlighting the project (below)

at the bottom of the page, i'd like the footer to be able to read out the same as the original index (Image 1) and link to image 2 in the same fashion. 

I know that's a lot and i may just be unable to in general, but any help would be much appreciated. Thank you!