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There isn't really an explode option (csv column → rows) within Magic ETL. You can leverage a MySQL dataflow to help normalize the data. Code like https://stackoverflow.com/questions/17269444/split-explode-comma-delimited-column-values-to-rows may help you do this.

You can do that with SQL as suggested or with Magic ETL (somehow I always end up visiting @MarkSnodgrass video on how to build a Word Cloud whenever it comes to a request like this), the logic would remain the same, you just change what the delimiter is that you're splitting by (and might want to add a trim after splitting or a replace for all blank spaces so POs are more or less clean).