Grade columns in Blackboard are easy to remove! Although, if the grade column was generated by creating a gradable item in your course, you will need to delete the gradable item before you delete the grade column it is associated with. You will not have the option to delete the grade column if the parent/host item still exists in your course.
If you have manually created the grade column, you should be allowed to delete the column without hindrance.
To remove a Grade Center grade column:
• Access the Full Grade Center in your course
• Click the chevron button on the right-side of the column you wish to remove
• From the drop-down menu, select Delete Column
• A message will appear saying “Delete this column and all of its associations? This action is final and cannot be undone.”
• Click OK.