CSS I think!

I have a CSS file for my pages. HTML from scratch (just to learn the stuff and then when I can afford a wysywig tool). What I would like to do is get some other things into a common file so I have one place to edit them so when I replicate my main page for the others on the site (about 6 below the index.html) I do not have to go round them all. One example is the html for the horizontal nav bar, ul, li, etc. I'm probably missing something here. Can someone give me a lead. I played with dreamweaver once and this seemed to 'know' that other pages are affected and ask to update them.

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