BEx Analyzer: changing only result row

Hi experts,

In BEx report, how to change only the result row value for a particular key figure column?

For example,

Marks Scored

Person1 : SUB

Physics 30

Maths 40

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Result 70

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Person2 :

Physics 40

Maths 50

----------------

Result 90

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Overall Result 160

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Marks Scored-> Key Figure