Disaagregation Keyfigure across different planning level in IBP

Hi All,

I am having a stored KF "A" at Daily-Location base planning level .I got another stored KF "B" who is at Daily-Product-Location now i want to store value in 3rd KF "C" @dayprodloc who should be having calculation based on A@dayloc - B@dayprodloc. How to achieve this.

Regards,

Arun.S