To add course activities (Assignments, Discussion, Quiz, etc.) that you have already created in your course to a module or sub-module:

1. Click the Existing Activities dropdown.
    
2. Select the type of activity you'd like to link to: Chat, Checklist, Discussions, Assignments (Dropbox), ePortfolio Item, External Learning Tools, Quizzes, Self Assessments, or Surveys.
    
3. Select the name of the activity from the list, or create a new one (in this example Assignment 1).