Calm down. Just trying to establish where you are starting from. If you only want to run the grapple then a diverter valve kit is simple and easy. First Google hit:
Hydraulic Diverter Valve Kit - ANBO Manufacturing
An example of a member here who installed one
http://www.tractorbynet.com/forums/customization/69093-another-diverter-valve-grapple-setup.html
Adding a third SCV is tougher especially with a cab. Your existing loader valve should have a power beyond port that is supplying your three point hitch. You would intercept the oil supply there and use it to feed your new valve, either electronic or manual. The power beyond from that valve would feed your three point hitch and the third port returns to reservoir (transmission).
Edit: I just saw this is your second thread on the same topic. Are you wanting different answers this time?