In your example you have BS4 = 20
Shouldn't that be 0 and BS5 should be equal to 20?
If that is correct then
C4: =IFERROR(INDEX(DATA!$F$11:$BU$1161,MATCH($A4,DATA!$D$11:$D$1161,0),MATCH(C$2&"Closing",DATA!$F$8:$BU$8&DATA!$F$10:$BU$10,0)),"") Ctrl+Shift+Enter
Copy across and down