The treatment planning software works by placing the teeth into the final position you want them to be in, and the software generates all the stages for that movement. Each stage is represented by a dot along the timeline. When exporting, each stage will have a model generated for printing.
Moving teeth - movement widget
Changing pivot position
To change the pivot position for the tooth, click on the green dot that coincides with the desired pivot point.
Moving teeth - exact amounts
Moving teeth - incremental amounts