How to Calculate Accumulative sum for Separate products with Script?

[Anonymous]

I have a table, I need to show the cumulative sum of the 'Total' column for each products. For example: If i select product 'B' then i should the get the cumulative sum of Product B alone with respective date. i.e 15+2+3=20 not 47+49+52.

I need Output as Below.

Not Like this

[jyothish8807]

You are welcome