Hi
I currently have the following formula in Column C
=IF(A31=A30,CONCATENATE(TEXT(A31,"ddmmyy"),SUM(RIGHT(C30,3)+1)),CONCATENATE(TEXT(A31,"ddmmyy"),101))
Basically this looks at the value of Column A, and if the date is the same as the row above, It will add 1 to the last digit, (which is...