I want to loop through dataset and for each barcode to see if exists in other rows
example 12345 is found in the 1st and 3rd row then take the 3rd rows quantity value for the barcode 12345 and add it to the 1st row quantity result should be 42+45=87 after this delete the last row in this case the 3rd row then continue with the barcode 56789 and with other rows
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