Related Products (kits) in CRM 2013 vs 2011

I had a very strange issue that was hoping you would have insight into.

Friend moved from CRM 2011 online to CRM 2013. They had products setup as Kits and products that were associated with the product to form the kit (or what they call bundle).

However, now in 2013, we can't seem to find the list of those related products in the UI. the API returns the related products, but can't see them in the UI. If we go to substitutes nothing is listed. In the administration section we see a default relationship of Products:Products...

Basically HOW do you see kit products in teh UI and how to then add/edit/remove those related products?

Thanks in advance!