Instructions
Turn on the Wii console. Press the "Home" button on a Wiimote that has been synced to the console using the standard setup.
Select "Wii Remote Settings" from the bottom of the screen.
Select the "Reconnect" option.
Press the "1" and "2" buttons at the same time on each controller that you want to connect to the console during this play session. The LED light will blink during the syncing process. When it stops, the connection is complete.
Power off the Wii console when you wish to restore the standard syncs to each controller.