Hi Tracy, thanks for the kind words. im not sure why you need the grade in the expression. when you publish your report, the user will not know whether you created a dimension or expression. having said that you can still create your expression and in presentation hide the dimension that you dont want shown.
also, if you want to call someone's attention, you should call out their name @Name. so ir shows in their notification. otherwise that person will not know that you were calling his/her attention
