How do I remove rubrics from a report card?

If the class is no longer associated with a rubric, then you can run a 'Find Posted Grades' query for the class that has the specific grades you want removed and then delete them. Doing so removes them from the report card for any student you wish to not have this rubric included on their report card. And as long as the rubric is no longer associated with the class, these grades should not be re-added to their report card document after their initial removal.