You cannot create custom marks in Aeries.
Two already exist: NA and TX.
NA is Aeries’s “excused.” NA will mathematically excuse an assignment from calculating into a student’s overall grade.
TX means “missing but temporarily excused.” The assignment will not mathematically calculate against a student’s overall grade but it will show up on a student’s portal as a “missing assignment.”
To create a “Missing” mark in Aeries, leave a cell blank and click the “grading complete” button. This will cause the blank cell to mathematically calculate as a zero. Then in the Status or Comment column, write “missing” or “needs to turn in/make up.”