How to clear a Course discussion board chat?

Hi,

Thank you for contacting Adobe Captivate Prime Team.

We can have only one discussion inside a course. The users enrolled in the course can use the same discussion.

They can post comment and question which will be available to everyone enrolled in the same course.

In case you want to use separate boards for different groups of people, we can do it using Social Learning.
Here we can create a board and assign it to a group of people to use.

Kindly visit the link below to know more about Social Learning in Captivate Prime.
https://helpx.adobe.com/in/captivate-prime/learners/feature-summary/social-learning-web-user.html 

Kindly let me know if any further assistance is required.
Hope to hear from you soon.

Regards,
Debiprasad Maharana
Adobe Inc.