You can use the
Utility -> Save Data Node which will give you the Decision tree output variables
Connect it to the Decision Tree Node which contains your model
Filter the Save Data Node variables based on the the sales representatives Name and _NODE_ (Or accept all which is the default)
Choose the output file format and names from the Properties Panel
Run the Save Data Node
Find the output file directory in the Save Data Node Results.
Open the file and you will find all your data set observation with the node ID