Dreamweaver Website Template – Duplicate With Css?

Adobe Dreamweaver has an ability to create a template to use on an entire website, and all you have to do is create the parts of the webpage that will remain the same throughout each page, such as the structure, background, and navigation, and then you specify the parts of the template that are editable, kind of like an empty table cell where you can put all you text and graphics that are specific to each page. then when you create the individual pages, you link to this template, make your changes for that page, and upload them along with the template document. This is especially helpful with large websites, where if you needed to make a change to the navigation for instance, you wouldn’t have to edit and reload hundreds of pages, just one document (the template).
I have been trying to find out how to accomplish the same thing without the need for dreamweaver, as I already have a program I use, and cannot to afford to buy the program, and downloading trials every month is not ideal. I’ve been learning css, and am very fond of using external style sheets, so I was wondering if it’s possible to do the same thing as dreamweaver, using css somehow.
Any help what-so-ever, whether a full answer or at least a point in the right direction, would be very much appreciated. Thank you!