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If I understand you correctly, col1 has dni and telephone, and col2 as the dni or phone value, right? On the output you want 2 columns, one for the dni, one for the phone.
Send the input into a tmap and concatenate cols 1 and 2 into single delimited output column.
row1.col1 + ";" + row1.col2
The send the output of the tmap into a tDenormalize component.
Is this what you are looking for?