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You'll need to utilize a Magic ETL for this. You can take the dataset as your input. Then feed it to a Select Column Tile. You can then select the Supervisor Name and the Email columns where you rename the Email Column to 'Supervisor Email'. Then feed your original dataset into a Join tile where you will left join your data with the output of the Select Columns tile where the Supervisor Name = Supervisor Name. This will then add in a new Supervisor Email (which we named in the prior steps) and should then have the supervisor email for every other employee.