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You can lock conversations or topics if you’re the owner of the group or have permission to lock posts.
When you lock a conversation, you block all replies to posts and other activity on it.
To lock a new conversation: When creating the new conversation, to the right of the subject, click Lock conversation .
To lock an existing conversation: When viewing the topic, in the upper right, click Lock conversation .
When you lock a topic, you block all replies to posts and other activity on it.
You can also block replies to posts in an existing topic but leave the topic itself unlocked.
To lock a new topic: When creating the new topic, check the Lock box.
To lock or block replies on an existing topic: When viewing the topic, at the top, click ActionsLock topic or Lock replies.