The easiest way to do this is to keep the sections in separate documents so the style definitions can be different. You could then merge the separate Word documents into a single PDF if needed.

If you MUST merge these into a single Word document it does become messy and you would almost certainly want to use a macro to apply a different style according to the section your style appears IF the content already exists. If the content doesn't already exist then you just need to know where you are when you are choosing styles.

The macro would probably be simplest and run fastest if you had a standard way of bookmarking each section. That way, instead of iterating through every paragraph you could do a find/replace in a range.

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Andrew Lockton
Chrysalis Design, Melbourne Australia