I must not understand how to use this because I get #N/A.
For region rank formula I have
=RANK(AI2,$AI$2:$AI$351)
For division rank formula I had before change
=RANK(AI2,$AI$2:$AI$10)
after change
=RANK(AI2,INDIRECT("B" & MATCH($AI2,$AI$2:$AI$351,0) & ":B" & MATCH($AI2,$AI$2:$AI$351,1)+1))...