To perform migration, you need to install Migration Manager, a Parallels Plesk Panel component not included in typical installations.
You can obtain and install Migration Manager using the following ways:
To install it through the Server Administration Panel, go to Tools & Utilities > Updates. The Parallels Installer web interface will open in a new window or tab. In the Installer window, click Cancel updating, click Add Components, select the checkbox corresponding to the Parallels Panel Migration Manager component, and click Continue.
For instructions on installing the Migration Manager through the console installer, refer to the Installation and Upgrade Guide, chapter Upgrading the Panel, section Upgrade from the Command Line. The guide is available at http://www.parallels.com/products/plesk/documentation/.