Again I would like to post a link to an Oracle Red Book written by Hsing Huang and Maria Gummerson. It outlines how to properly customize your application GUI & Branding. PeopleSoft has special tools that support lots of branding customizations without having to impact the whole application. Here is an excerpt:
â€œBranding code resides in two different application packages/classes. For standard PeopleSoft Branding, itâ€™s PT_BRANDING:BrandingBase.â€
Enjoy and let me know if you have any questions.