Yes, you can. The port marked "PB" stands for "power beyond". You would take that line off then:
-From the PB port on the FEL valve to the IN port of the new valve
-The PB port of the new valve would connect to the line you removed (it feeds the 3PH)
-The OUT port would get Tee'd to the OUT line of the FEL valve-basically dumps back to the tank.
Search the term "power beyond" here in the hydraulics forum...