Hi all.
After having spent a day configuring the design of my online shop, I've gotten to the point of configuring and adding products.

How can I add fields such as ISBN, Author, Condition, Year to my products?
I'd ultimately like a "Product Type" for Books with these properties.

It seems quite easy to do in OpenCart, however I cannot figure out how to add a product type in Zen Cart? Now that I've customised my layout etc, it's too late to move

Cheers.