subsections in the product section list

[fredsshed]

How can I include subsections in the product section list? I'm looking for something like this http://www.lawrence.co.uk/acatalog/P..._Acrylics.html nothing fancy, no bullets indents or anything else needed.
Thank you

[NormanRouxel]

Welcome Fred. Without seeing your site or knowing which Theme you're using it will be hard to help in detail.