Webtrends Analytics 9 Adminstration Guide, November 2012
If your website content is dynamically generated, URL Parameter Analysis helps you understand requests for content more effectively by creating reports that show which parameters are used in page requests.
Webtrends Analytics 9 has several features that affect reporting on dynamic page URLs. If you want to decide what parameters to include in your URLs so you can improve the standard page reports such as the Pages report, you should use URL Rebuilding. If you have problems reporting on non-standard URLs and you want to modify your URL data by searching and replacing strings of data, you should use URL Search and Replace.