How to set the line break in Excel Template

I am referring to the document below to create a Excel Template.

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• For loops and groupings not inside another group (that is, outer groups) you must select the repeating data element to be used. For example if the data set is flat, the only repeatable element is /DATA/ROWSET/ROW. In cases with multiple data sources or hierarchical XML you can choose the data set.
• If you are creating nested groups (inserting a loop or group inside of another loop in the template), the On Grouping checkbox is selected and the For Each field is not editable because it is already defined by the preexisting outer loop. The