When a source row contains groups of repeating columns, you can define column groups on the Normalizer tab. The Normalizer transformation returns a row for each column group occurrence instead for each column occurrence.
The level number on the Normalizer tab identifies a hierarchy of columns. Group level columns identify groups of columns. The group level column has a lower level number than columns in the group. Columns in the same group have the same level number and display sequentially below the group level column on the Normalizer tab.
The following figure shows a group of multiple-occurring columns in the Normalizer tab:
In this example, the NEWRECORD column contains no data. It is a Level 1 group column. The group occurs four times in each source row. Store_Number and Store_Name are Level 2 columns. They belong to the NEWRECORD group.