The Code Navigator provides a hierarchical outline of the following in your Project:
The Code Navigator is a virtual representation of your EPUB (and items that are used in the compilation of your EPUB, such as Templates and Extensions). When a Book is exported to EPUB, the hierarchy shown in the Code Navigator will be reflected in the exported EPUB.
Working with Code Navigator
Manipulating the contents of the Code Navigator is easy. When the list of Resources contains custom items, the Edit button will appear on the toolbar at the base of Code Navigator. Tap the Edit button to rearrange or delete custom Resources.
You can import external files into your Project by using the Import Files… command.
When editing code, you can link other Resources by using the Insert Link… command.