Trying to calculate a YTD running sum by Month where the cumulative amount resets the next year as below.
AYear Amonth SumOfFreight RunTot FDate
1995 1 $2,798.59 $2,798.59 Jan
1995 2 $1,675.06 $4,473.65 Feb
1995 3 $2,165.37 $6,639.02 Mar
1995 4 $1,661.66 $8,300.68 Apr
1995 5...