As you work with your project, you'll use Project Builder to create new items (such as components or classes) or to add files (such as images) that you created with other programs to the project. For items in certain suitcases (such as subprojects and frameworks), there's a specific command to add them, discussed in the section about the suitcase. For other suitcases, you use the following procedures.
To create a new item of a particular kind:
New in Project.
Add Files.
In addition, you can drag a file directly onto the suitcase icon in the browser, and the file is copied into the project and added to the suitcase.
To delete items from a project:
Remove Files.
A panel appears, giving you the option of removing the files from the project only or from the disk as well.