Here is how I set up a 3 position flap in the 9C.
First link Ch6 to Vr-A so that the end points can be set. Once the travel from no flaps to full flaps is adjusted, link Ch6 to Sw-C.
Second go to Pmix7. On the 2nd page, set:
MIX>OFF (shows when Sw-C is in up position)
MAS>FLAP
SLV>ELEV
LINK>ON
SW>C
POSI>CNTR&DWN
On the 1st page of Pmix7,
POS1>0% (no flaps)
POS2>0%
POS3>xx% (put Sw-C in center position and set 1/2 flap deflection)
POS4>0%
POS5>xx% (put Sw-C in down position and set full flap deflection)