Sumproduct columns?

Morning all,

I have a set of data that is split into three columns daily. How can I sum the column totals, i.e. A3+D3+G3+J3 and B3+E3.....

I have data going back to 1995!

Thanks in advance

Total: M3: =SUMIF($A$2:$L$2,M$2,$A3:$L3)
where M2 reads Total.

copy across to O3:P3 where O2 = "Valid" and P2 = "Invalid"