(FSG) referencing rows in column set calculation?

 Hi Guys..

I have looked far and wide, in vain: on my income statement, I'd like to determine the percentage of each lineitem based on Total Revenue and also based on Total Expenses.

So, my devised plan is to reference the "Total Revenue" row (from Row set definition) in the "% Total Revenue" column. This way, down the column, each lineitem is divided into the lump "Total Revenue." The same will be done for "Total Expenses" row.

How is the best way to achieve an outcome?

Thanks Guys,

Chris