Click OK . Selecting Delete all messages in this topic while displaying the topic All will delete all of the messages in Discussions . From the Discussions table, click Manage Messages . The Manage Messages screen appears. By default, Manage Messages displays the topic All .
Threaded messages are a series of replies to the same subject.
To expand a thread, click the hyperlinked triangle. Select Delete all messages in this topic and then click Go . A warning message appears. Click OK . All messages in the selected topic are deleted.