The Alias for Item A is set to “NEWACT”. When you type NEWACT it starts a new ACT, changes the element to ACT BREAK, replaces the text with ACT, and increases the Act Number.
The Alias for Item B is set to “SAMEACT”. When you type SAMEACT it changes the element to ACT BREAK, replaces the text with ACT, but keeps the same Act Number.
The Alias for Item C is set to “NEWSCENE”. When you type NEWSCENE, it changes the element to Scene Label, replaces the text with SCENE (if appropriate), and increases the Scene Number (or not, depending on whether it follows a New Act and on your settings in the Format > Element Styles... menu).
