Linking Products to list together?

Hey guys,

I've been searching for this, but can't narrow my search down enough to find what I'm looking for. Hopefully someone can direct me the right way.

I would like to be able to list sub-products under certain products.

For instance:
I sell guitars, and strings

I want to sell elixir guitar strings with certain high end guitars. When someone goes into my "Guitars section" and pulls up a guitar (i.e. a Fender), I would like to list the guitar strings "suitable" for that particular guitar along with it. A sub-product if you will.

Are there any modules I can install, or does Zen Cart already support this?

Thanks so much for a great shopping cart, and excellent support. This is my first site, and my first time posting here!

-Mandelbrot

Maybe here:

http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=309