Hello @FayeB
Thanks for posting this in the Canvas Community!
I understand you have some questions about rubrics being used in your sub-accounts.
The way I understand it is that you can set up a rubric on the sub-account level. When the instructors set up their assignment, they can then select the specific rubric you created to be used on the assignment they are using. The rubric settings will only be available once it is associated with the assignment, discussion, or quiz. This gives them the freedom/ability to decide if they want to write free-form comments when assessing students, Remove points from rubric, Use this rubric for assignment grading, and Hide score total for assessment results.
When setting up the rubric on the account/sub account level, it will not give you these option. You will only be able to select these options once it is associated with an assignment, quiz, and discussion on the course level.
Hopefully this helps!
-Colton