How do I create an Assignment shell in an Assignment Group?
You can create an Assignment shell on the Assignments index page. Assignment shells are placeholders for the Assignment until you fill in the Assignment details.
Create Assignment Shell
In an Assignment Group header, click the Add icon.
Enter Assignment Shell Details
Set the Assignment type by selecting the type drop-down menu , enter the Assignment title in the Name field , click the Calendar icon to select a due date  or manually enter a due date, and enter the number of points for the assignment in the points field . Click the Save button .
Note: If you want to edit the assignment details now, click the More Options button .
Visit the Assignments chapter to learn about the different types of assignments you can create within Canvas.