Understood, thank you Lefteris.
This is an unusual project, where K2 has been used as a product catalog, but the subcategories are used as products and the Items as product variations (different editions of the same product).
I guess I can try and build the "product grid" manually, since there are relatively few products (approx.20).
Thanks again to both of you for your time. I have been using Joomla for many years but have just recently started working with K2. Great extension.