Parameters | Utilities | Row Variables

Row Variables
Unique combinations of the values of these variables form the rows in the Output Tall Data Set.
Caution: This specification must be consistent with what you specified for Column Variables, otherwise an error message is printed in the SAS log concerning more than one observation per BY group.
To Specify Row Variables:
The Available Variables field becomes populated with variables from the specified input data set.
Left-click a single variable, or hold down Ctrl while left-clicking multiple variables, from the Row Variables field.