In Canvas you can create Assignment Groups to organize the assignments in your course. Here is how to create assignment groups:
1. Click Assignments in the Sidebar of your course.
2. Click the Add Assignment Group link.
3. Type the Assignment Group title in the Group Name field.
4. Click the Update button to create the Assignment Group.
When you are finished creating your assignment group, you will have the option to place when you create new assignments.
For more information on Assignments, please see the Canvas Guides.