Your question is very general but if you really needed to move parameters, you could use a MOV instruction to the PID destination tag. For instance, Extruder_Part_1_setpoint ---> Extruder_PID.SP
You could also right directly into Extruder_PID.SP from a Panelview or a recipe within a panelview. If you explain a little more of what your trying to do, we could get you more of a direct answer.