The Variables By Which to Merge Annotation Data field indicates the variables from the Input SAS Data Set by which to merge the Annotation SAS Data Set . The variables specified here must be present in both the input data set and annotation data set .All of the variables in the specified input data set are displayed in the Available Variables field.
Highlight the variables to be used to key the merge. To highlight multiple variables at once, hold down while left-clicking on them.
Click to add the highlighted variable(s) to the Variables By Which to Merge Annotation Data field, as shown below: