Hi Smith,
Why are you creating multiple tables first? what is the difference in the variables among all these tables?
if it is a single table then you can apply break on the first column i.e. current,past etc
Try this for current
currentmeasure/sum([TotalMeasure] In([MonthYear]))
Here currentmeasure the one which you are displaying in first table and month year is Jan 2012 etc
Total measure is the one which you are displaying in the 3rd table
below is a sample example
| 2001 | 2001 | 2002 | 2002 | 2003 | 2003 |
Q1 | $2,660,700 | 0.33 | $3,326,172 | 0.25 | $3,742,989 | 0.25 |
Q2 | $2,278,693 | 0.28 | $2,840,651 | 0.21 | $4,006,718 | 0.27 |
Q3 | $1,367,841 | 0.17 | $2,879,303 | 0.22 | $3,953,395 | 0.26 |
Q4 | $1,788,580 | 0.22 | $4,186,120 | 0.32 | $3,356,041 | 0.22 |
Sum: | $8,095,814 | $13,232,246 | $15,059,143 |