You can assign an assessment to multiple class sections at once without having to go into each section individually.
(1) When you are ready to assign the assessment that you've created, you can add all the class sections based on the grade and subject pairing of the class. Put a check in the box beside the class.
(2) If you wish to assign to individual students, simply select the students from the dropdown on the right e.g. in the following example only 2 of the students in the class will be assigned this assessment.