HI HomerJ,
The recommendation is not to edit this file. If you are really intent on editing this file, then the global sheets for this set up are found within the Style Sheets folder. The global sheets for all projects are located within the StyleSheet folder of the server under the site admin (sa) folders. The default patch for this on a traditional install is as follows: C:ProgramDataHPALMrepositorysaDomsInfoStyleSheets The Default.xsl is for the auto mail settings and the others are for the specific modules, ie BUG doe defect.
If you copy these to an individual project style sheet folder it will override the gloabl default for that project. Once again it is not recommended to override this file, but thes are the settings if you intend to do so at your own risk.
Good luck and I hope this answers your questions.