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There is plenty of documentation on how to add parameters to a category in a Python Toolbox i.e. see the bottom of

But I haven't found a way to do this for a Python Script Tool. Can this be done?

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up vote 7 down vote accepted

Yup, you need to use the Tool Validator. See this help link:

def initializeParameters(self):
  self.params[4].category = "Options"
  self.params[5].category = "Options"
  self.params[6].category = "Advanced"
  self.params[7].category = "Advanced"
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