Hi,
If you can produce the Summary by Pivot Table, it is highly recommended. (please follow the above post #3 p45cal's describe)
Although formulas can do the same job, but it is complicated and needed to remove duplicate cells in multi-column by expensive formula.
Here's the file attached and formulas used for your understanding purpose.
1] In "Summary Sheet" Month column A2, array (CSE) formula copy down :
=IFERROR(INDEX('SAMPLE DATA'!B$2:B$3499,SMALL(IF(FREQUENCY(IF('SAMPLE DATA'!B$2:B$3499<>"",IF('SAMPLE DATA'!C$2:C$3499<>"",MATCH('SAMPLE DATA'!B$2:B$3499&'SAMPLE DATA'!$C$2:$C$3499&'SAMPLE DATA'!$D$2:$D$3499,'SAMPLE DATA'!B$2:B$3499&'SAMPLE DATA'!$C$2:$C$3499&'SAMPLE DATA'!$D$2:$D$3499,0))),ROW('SAMPLE DATA'!B$2:B$3499)-ROW('SAMPLE DATA'!B$2)+1),ROW('SAMPLE DATA'!B$2:B$3499)-ROW('SAMPLE DATA'!B$2)+1),ROWS(A$2:A2))),"")
2] In "Summary Sheet" Gender column B2, array (CSE) formula copy across Area column C2 and all copy down :
=IF($A2="","",INDEX('SAMPLE DATA'!C$2:C$3499,SMALL(IF(FREQUENCY(IF('SAMPLE DATA'!C$2:C$3499<>"",IF('SAMPLE DATA'!D$2:D$3499<>"",MATCH('SAMPLE DATA'!C$2:C$3499&'SAMPLE DATA'!$C$2:$C$3499&'SAMPLE DATA'!$D$2:$D$3499,'SAMPLE DATA'!C$2:C$3499&'SAMPLE DATA'!$C$2:$C$3499&'SAMPLE DATA'!$D$2:$D$3499,0))),ROW('SAMPLE DATA'!C$2:C$3499)-ROW('SAMPLE DATA'!C$2)+1),ROW('SAMPLE DATA'!C$2:C$3499)-ROW('SAMPLE DATA'!C$2)+1),COUNTIF($A$2:$A2,$A2))))
3] In "Summary Sheet" Total Sales column D2, formula copy down :
=IF($A2="","",SUMIFS('SAMPLE DATA'!E:E,'SAMPLE DATA'!B:B,A2,'SAMPLE DATA'!C:C,B2,'SAMPLE DATA'!D:D,C2))
p.s. array formula to be confirmed by pressing CTRL+SHIFT+ENTER 3 keystrokes altogether.
Regards
Bosco