D2L (Brightspace) - Copying Course Components
For general questions about D2L's Import/Export/Copy Components feature, UW Oshkosh has an excellent starter guide:
UW Colleges instructors can copy course materials such as Content, Quizzes, Discussions, News, and Gradebook from one course in D2L (Brightspace) to another.
UW Madison also has some great guides on the subject:
Learn@UW - Copying Groups from Another Course May Fail to Copy All the Groups Within Certain Group Types