If you want to set a default grade for a certain assignment, use the assignment drop-down menu. This will allow you to input scores for students who do not have scores or to overwrite already entered scores.
In Course Navigation, click the Grades link.
Open Assignment Drop-down Menu
Hover over the assignment title and click the drop-down menu.
Set Default Grade
Click the Set Default Grade link.
Create Default Grades
Type the default grade in the text box . If you would like to overwrite existing grades for the assignment, select the Overwrite already-entered grades checkbox . Click the Set Default Grade button .
Verify Default Grades
Click the OK button to view the new default grades.
View New Grades
Default grades are automatically entered for all students who do not have a grade. Grades can be changed by clicking the default grade and typing in an updated score.