To add files to an existing project, follow steps below:
A context menu appears.
The New Folder window appears.
The Advanced Settings appear.
The Browse for Folder window appears.
This will put the new folder into the project under CodeWarrior projects. When the new folder is expanded, it will point to the location where the folder is linked from. If you delete the whole folder from the project, it will be deleted from the project only. If you try to delete a file from this folder, it will be deleted from that location leaving no way to recover it.