I am having some trouble using sum with Index, Match, Match.
My Formula is =SUM(INDEX(Sheet1!$B$1:$R$50,MATCH('July 2018'!$B10,Sheet1!$B$1:$B$50,0),MATCH('July 2018'!$O$2,Sheet1!$B$1:$R$1,0)))
I need to cross match two categories and where that information meets up, I need to sum.
Thanks