Ok thanks macropod, got me a bit further but the main objective is to be able to open a new blank document write a document for a company XYZ, (which has a specific style guide), click on a button in the Styles group and magically change all the fonts and headings to the specified style. It seems Word 2007 cannot do that.


I can open an old document (for testing purposes) and apply XYZ styles but to be able to change style i have to select text and then change it to the required style. If I have a 10 page document it just seems so clumsy...

Create a separate template for each company. Use that template as the basis for new documents for the company. That is one of the purposes of templates.
Templates in Microsoft Word
Understanding Styles in Microsoft Word

Word doesn't do magic, but it does provide all the tools you need.

As Charles indicated, what you should be doing is using a separate template for each company with the Styles in a given template formatted accoring to that company's requirements. That way, when you create a new document for company ABC, using the ABC letter template, all the required Styles will be there, with the required page layout and paragraph formatting. Use the ABC memo template and the page layout and paragraph formatting for an ABC company memo will be there. For company XYZ, you'd use equivalent templates specific to that company.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]