There are two types of service items included in the catalog; portal service items, which correspond to landing pages within the AIR Bundle, and templates, which you can clone to create new service items within Remedy. Portal service items directly correspond to jsp pages within the bundle. These service items generally do not contain any questions or elements and are designated with the type "portal". The bundle will use these files to generate pages such as the category listing page or the submitted requests page. These pages are usually associated with a specific package in the bundle.
Portal service items allow you to add pages to your bundle.
When to use this feature?
Each package will require a corresponding portal service item to render it's portal page. If you add a new package to your bundle you will need to create a new portal service item.