When opening a video take uploaded from the teleprompter app in the storyboard composer, the segmentation into scenes is either done automatically or manually.
If in the script editor, you have applied Close Captions, your take will be automatically segmented into topics or sentences
If you have not added Closed Captions you need to create the scenes manually.
First, open the scene trimmer
1. Select a region to create the first scene
2. Preview the scene by clicking on the play button.
3. When you are happy with the location click "Scene from Selection", the trimmer will move automatically to the end of the first scene, so you can select the second scene, and so on...
You can then add captions to each segment and edit them. Editing Caption