3 Wire Switched Outlet. Connect the last switch in the usual manner looping the wire around the screw in a clockwise direction. Cut off the loop on the end of this wire.
Instead of running a separate pigtail from the hot wire to each switch just leave the hot wire extra long. Outlets are split wired so that the top half of the receptacle is live all of the time and the bottom of the receptacle is controlled by the wall switch. The neutral is connected from the main breaker to all outlets neutral terminal.
Zooz was quite correct that us code in most locations requires that an outlet be able to handle 15 a but it is lower for light switches so if a switch is only rated for lights you may not be able to use it to control an outlet.
Ground wire is connected to the outlets as well as shown in the fig. Each half hot switched receptacle will require a neutral wire ground wire non switched hot wire and a wire that is controlled by a switch. In your example of converting one or more receptacles within multiple half switched receptacles the process would include disconnecting from the receptacles the wire controlled by the switch and. The neutral is connected from the main breaker to all outlets neutral terminal.
