How to append line in excel

I have an excel ,in cell I3 has value then I need to copy to next cell J3 ,whenever I am writing something in I3 it need to get append on J3 with comma separstor


Check as below for your reference

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In excel if the cell I3 already has value and I need to add new value with. Comma separstor each time new values comes it should write in the cell with comma separator without deleting the previous value in the cell I3