Overview : Importing course components with existing names or duplicates won't overwrite; duplicate names persist. For instance, importing a discussion topic may result in multiple topics with the same name. Similarly, when importing a grade scheme, it copies only if unique, not associated with a duplicate grade item in the course offering.
If you import course components with names that already exist in the course, or you import multiple components with the same name, duplicate names appear; they are not overwritten. For example, if your course contains a discussion topic called Exam Review and you import a course package that contains a discussion topic called Exam Review, your course will contain two topics called Exam Review.
Note: When importing a course, if you previously had text in the quiz Introduction field, this text is automatically appended to the quiz Description field.