@RoDe
what @mzimmerman has provided does explain some of the functionality with assignment groups.
If I understand you correctly, I do not think it is possible to do what you want. I believe your wording is a little different from what Canvas uses (as Mzimmerman noted).
You have 3 assignment groups with a weighted gradebook (I'll use hypothetical numbers) Exams (40%), Quizzes (30%) and assignments (homework or other types 30%).
your total column is the grade calculation based on those weights.
You want to add another column that would take the exam scores and the quiz scores (weighting could still be 40% and 30% total would just be taken out of 70 instead of 100) and report that average(however it is calculated). Then the requirement to pass the class is at least an overall course grade of say 70% (score reported in the total column) and at least a 60% on the exams and quizzes.
If the above is what you want, then I do not know of a way to do that in Canvas directly.
You could add another assignment group called Quizzes and exams and give it a weight of 0%. Put one assignment in there titled QuizExamAverage. Then you would have to export the grade book, perform the calculation you want for the Quiz Exam combined score and store it in the assignment QuizExamAverage and then import the csv file. That way, that average is reported to the students in the grade book, but it has no affect on their course grade.
I hope that helps some. If not, post some more information and we will see what happens.
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