I do not want Canvas to calculate my students' final letter grade. I want the freedom to issue the semester letter grade in an additional grade center column. For example, a student earns 895 points out of 1000, a B on my grade scale--but the student clearly deserves an A in the class. How do I create a column that lets me manually type in the letter grade that I will post to his/her transcript if different from the grading scale? Basically, how does Canvas let me work as effectively as Blackboard, letting me enter grades as "text," rather than "percent" or "numerical score"?