Use this field to specify the variables from the Input SAS Data Set by which to merge with the Data Set to Use for Filter.If this field is left blank, these merge variables are assumed to be the same as the key merge variables specified for the Data Set to Use for Filter.
Left-click a single variable, or hold down while left-clicking multiple variables, from the Available Variables field.
Click to add the highlighted variable(s) to the Variables By Which to Merge Filter Data Set field.