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In the navigation pane, select Revisions.
The Revisions page for the comment opens.
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From the page toolbar, click Create Revision.
A new revision of the comment is created in the "Private" state. The Revision column updates to indicate that the current comment now has a higher revision available. The new comment revision has all of the same relationships to its parent objects that the previous revision had.
After you have created the first revision of a comment, the Replace By New Revision and Replace By Last Revision commands are available from the Actions
menu.