Question categories are seperated into different contexts, each with a seperate hierarchy. Question category contexts are:

• Activity context: questions only available to one activity module.
• Course context: questions available to all activity modules in a course and within the course from the 'Questions' link in the Administration block.
• Course category contexts: questions available to all activity modules and courses in the course category (one course category can contain other course categories: you can share your questions in any or all of the parent course categories).
• Core System context: questions available in all courses and activities on your campus.

See also :

• Question categories
• Question permissions
• Question contexts documentation on EasyCampus Docs