You can use the following code in the SAS Code node to divide your data into training, validation and test datasets to be used for Enterprise Miner nodes
data &EM_EXPORT_TRAIN &EM_EXPORT_VALIDATE &EM_EXPORT_TEST;
set &EM_IMPORT_DATA;
if partition_key=1 then output &EM_EXPORT_TRAIN;
else if partition_key=2 then output &EM_EXPORT_VALIDATE;
else if partition_key=3 then output &EM_EXPORT_TEST;
run;
Put this code in the training code section which is the top icon selected in the image below.
Your flow would/could look something like this:
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