Hi ALL,
I am currently using this formula
=SUMIFS(INDEX('2018A'!U:AF,0,$BG$8),INDEX('2018A'!A:H,0,$BG$10),$BF$10,INDEX('2018A'!A:H,0,$BG$11),$BF$11,INDEX('2018A'!A:H,0,$BG$12),$BF$12,'2018A'!J:J,$C$7)/1000
AKA - SUMIFS((MONTH COLUMN, MONTH ID),(REGION COULMN,REGION ID),(SUB-REGION...