You can create custom class and subclasses for Notes in the Repository Manager.
To create a user-defined notes class
In the Navigation View, right-click User-Defined Note Class and select Add User Defined Notes Class. Alternately, on the Home tab, click Notes Class. The Add Notes Class window opens.
In the Name field, enter a descriptive name like Insurance policy.
In the Description field, enter a brief description about the note class.
Click OK to save your changes. The new note class is listed on the details pane.