Specify in this field the variables from the Base Input SAS Data Set that are to be transformed. The same variables must also exist in the Merge Input SAS Data Set.
Scroll through the Available Variables field to find the desired variables to transform.
Left-click to highlight a single variable. Hold down the key while left-clicking to select multiple variables.
Once you have selected variables to transform, click the button to add them to the Variables to be Transformed field.