When the project is first created, the project manager creates a design file with the same name as the project. It also creates a schematic folder within the design file, and a schematic page within the folder. The schematic folder icon is marked with a backslash character (\) to signify that it is the root schematic folder.
A design file also contains a design cache, which is like an embedded library—it contains a copy of all the parts and symbols used on the schematic pages.
You can view the hierarchy using the File tab in the project manager.
You can create a new design file to replace the design created by the project manager.
A new design inherits characteristics from the settings in the Design Template dialog box. You should check those settings before you create a design.