MIC results

Hi Experts,

We have one requirement in MIC result recording.

We are using 3-MIC’s 

Water-01, Water-02 and Water-03.

Requirement is whenever we do the result recording for Water-01 and Water-02,

then difference between Water-01 –Water-02 value should be get updated in Water-03 automatically.

Example:

Water-01 = 7

Water-02 = 5

Then Water-03 should be 2(Water-03 =Water-01 – Water-02).

Could you please guide me how to configure this requirement?

Regards,

Vijay