Thanks for the replies. I will study those links.

But MY IDEA of styles is that if you have lots of documents based on a template. If you change the styles in that template, then all of the documents should be updated to that style.

This would apply in a company, where the manager decides that from now "we will use Tachoma font in all of our documents."

Or in my case where I have 20 documents, based on one template and I now wish to change one of the styles. (Sure any new documents will confirm to my new style, but what about the other 20 documents that I created last month?