portfolio category linking

greetings,

how do I isolate a portfolio category so that it doesn’t link to other portfolio categories?

here’s what I’m doing. I have a video tutorial website and the categories represent a specific course that includes 3-5 videos. The problem I’m having is all the categories are merging together when viewing them via the ‘next’ and ‘previous’ arrows.

If this isn’t possible perhaps you could suggest a better solution.

Thanks