First, we need to make a home for our container. Create a directory on your computer.
Open Celtx and on the Splash screen choose the Film project. This opens a project container that has, by default, a Screenplay in the Project Library window which supplies us with the proper elements needed for formatting a feature movie screenplay (scene, action, character, dialog, and so on).
Now, in our new Celtx project, click on File, then Save Project As, and we get the following screen:
Save in the directory you just created.
Okay, now. In the Projects Library window, right click on the default name Screenplay, choose ...