As shown in the preceding illustration, there is an extra button at the bottom of Celtx's main script window in a Theatre script, second from the right, Cast. The following screenshot shows what we get when we left click on it:
It's a cast list that you fill out and—if the Show Title Page & Cast option has been clicked in Format Options (as shown in the preceding section), a cast list is added just before the script and after the title page, which looks as follows:
This feature should not be confused with the Master Catalog in the Project Library window, where Celtx automatically tracks all characters with a speaking part (and lets us manually add the bit players with nonspeaking roles).