I tried something like this..
=IF(OFFSET(J20,-$P$3+3*ROUND((B20-$P$3)/12-0.5,0),-1)<0,OFFSET(J20,-$P$3+3*ROUND((B20-$P$3)/12-0.5,0),-1),0)
I didn't know what to put as my condition true so I just chose < 0. In reality if my offset value is #Name? then I want a zero otherwise I want the actual...