Currently Being ModeratedSep 6, 2012 5:40 AM (in response to Awely)
Unfortunately, pages on the iPad does not support editing styles. The mac version is an extremely powerful piece of software (I know someone who has recently completed their PhD thesis in it), but the iPad version has only a fraction of the features.
The only word processor for the iPad I'm aware of that fully provides support for styles is UX Write - see http://www.uxproductivity.com (disclaimer: I've been involved with the development of this app). This is designed for the sort of high-end professional authoring tasks that you can do with Pages for Mac. Customisable styles are one of the most fundamental aspects of this app, and it provides extensive formatting options and the ability to define your own, new, custom styles.