Calculation of customer balance percentage from overall result

Hello Guys,

please help me out in customer due date analysis report for calculating the Customer Balance percentage from Total overall results in BEx Query Designer.

i have come through some of the threads for percentage calculation in SCN and got some hints.

Such as we can use the data function SUMGT for overall result. and %GT/CT For overall result percentage .

But getting confused how to use those functions for BALANCE Key figure.

shall i create calculated key figures ,and if yes then what is the exact formula for that.and how to use those.

Kindly Suggest.

Thanks

Ashish