Sum OVER specific values from rows

Hi,

Please help me with this issue. How can I create new value row from already existed one in data table?

Example:

I have Sales of 4 products reported per day. I would like to create new product from specific 2 from existing data.

Please check attachment to see the real data table.

Thanks for any help!

Greetings from Poland,

tymek

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(3) Answers

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