You can only delete discussion levels you created and only the most recent.
A level of a discussion can not be deleted if there are replies beneath it.
A top level discussion can not be deleted if anyone else has replied to it.
Access The Collaborator Panel on an object of list of objects.
Select the View Existing tab and select Discussions.
Any level of the thread that you have access to delete will display a Delete link.
Click a Delete link.
The Collaborator window refreshes with the discussion thread deleted. The message Reply Deleted appears at the bottom.
Access > My Enovia > Discussions.
Click the Discussion name.
The Discussion displays with all replies in the Flat View.
A level of the discussion that may be deleted displays a Delete link.
Click a Delete link.
Click OK in the confirmation message.
The Discussion redisplays with the reply deleted.