Hey, Manoj. That getPart function only exists in our instance of QIE (it is a function we built into our logic for pre-processing data before calling various message.setNode functions), so the broader QIE audience won't know how that function works.
Having said that, the syntax you're looking for would be this, assuming you're parsing a CSV with a column name of "Patient Name"
To get the last name: getPart("Patient Name", ",", 0)
To get the first name: getPart("Patient Name", ",", 1)