You can only delete a rubric from the org unit in which it was created and you cannot delete a rubric that is being used by a Competencies activity or ePortfolio item.
Copying a rubric creates a new rubric based on an existing rubric in the same org unit. The new rubric has the same properties, levels and criteria, and is shared with the same org units as the original rubric.
Holistic rubrics allow you to assess participants' overall achievement on an activity or item based on a single criteria using predefined achievement levels.
Select the check boxes beside the users you want to reject (the users you don't want to enroll in the course but want to keep on the list), and click the Reject Selected icon.