I guess I should clarify...
The navigation on the index page for both the category and collections is a list created by pulling the name of the table item, using a repeat region ordered by ascending order, and then it's filtered to the products page by the id of the table item for the link. So for instance, the first item in the categories column would be "/products.php?id_category=1" or something to that effect. It might not be the exact syntax that I'm using, but I'm almost 100% based off of what I can remember at this time. I'm not able to look at my project seeing as how I'm at work.