Tinderbox includes a number of specimen template notes to export using HTML, or other formats such as OPML. These are accessed from the File menu. Any necessary (root level) containers and/or prototypes these notes need are added along with the template. See more on templates.
The built-in template listing also includes templates from the application support 'templates' folder.
Templates that are also prototypes are not shown in the various pop-up template menus (such as in HTML view).