...
Instructors who teach multiple sections of the same course may prefer to manage those sections through a single parent course with associated child courses.
Please complete the Merge Course Enrollments Request Form to have your enrollments merged.
...
When courses are merged, Blackboard creates a new course shell and funnels the enrollments from the contributing sections into the new "parent" course. The Grade Center of the merged course will display a column labelled "Child Course ID" that can help distinguish how students are registered. This column can be used to create Gradebook filters /wiki/spaces/blackboard01/pages/154386419 and /wiki/spaces/blackboard01/pages/154385595.
...
To have your Blackboard course merged, please complete the Merge Course Enrollments Request Form