Clone an existing template file from the Wordpress admin area. Go to Appearance -> Add Page Template
Now fully compatible with child themes. Clone an existing template file without uploading new files via FTP. Optionally, a user can add a template name, so that the new file will be automatically recognized as a new page template in the post editor. If using a child theme, the new file will be copied from the parent theme folder into the child theme.
file-duplicator
folder to the /wp-content/plugins/
directory