WordPress does not have an option to move comments between posts or pages. Move Comments is a WordPress plugin that allows comments to be moved from one page or post to another.
It adds a sub-page under ‘Comments’ where you can filter comments by post or page title, tick the ones you want to move and finally select where to move them to.
Latest version: 2.4
Extract the download on your computer and upload the move_comments folder to wp-content/plugins/. Finally, enable the plugin from the ‘Plugins’ page.
Submit a Problem or Feature Request
If you have downloaded the plugin and either you spotted a problem with it or have an idea for a new feature, then please submit it to the issue tracker rather than posting a comment in the web site.
Don’t forget to include as much information as possible and check whether someone else has submitted the same issue before you press the submit button.