With BaseExtensions, we are able to either add or remove a bullet in PowerPoint.
Module is located here:
<Cmd case="BaseExtensions:add-remove-bullet" state="x" style="x" level="x"/>
remove to indicate whether the button should add a specific type of bullet to selected text or just remove any kind of bullet from selected text.
Define the indentation level which can be an integer from 1 to 5, where 1 is no indentation at all.
level has no effect when removing a bullet. Therefore, leave these parameters empty when creating a button that removes a bullet.