Parameters | Expression Parameters | Key Variable(s) to Associate with Input SAS Data Set

Key Variable(s) to Associate with Input SAS Data Set
Use this field to specify the variables from the Subset Data Set to Use for Normalization by which to associate with the Input SAS Data Set.
If left blank, it is assumed that the subset data set only contains Key Variable(s).
To Specify One or More Key Merge Variables:
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All of the variables in the subset data set are displayed in the Available Variables field.
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Click to add the highlighted variable(s) to the Key Variable(s) to Associate with Input SAS Data Set field, as shown below: