Chapter 6 (Pages 98-118) deals with Charts. You might want to read it! :)

This is a very comprehensive guide with all the details you might need.

Other iWork manuals here:
Keynote: http://manuals.info.apple.com/en/Keynote08_UserGuide.pdf
Pages: http://manuals.info.apple.com/en/Pages08_UserGuide.pdf

A quicker way to get support for Apple software is to post in theirsupport forums. You can find links to each software on this page - onthe bottom left - under the title 'User Discussions'
http://www.apple.com/support/iwork/