To add to the list of notes shown in the Add Notes dialog window follow these steps:
Select the Custom Commands icon from the main toolbar and select the Edit Layout Notes File (Layout.NTE). Click OK.
This will bring up the layout.nte file in notepad allowing you to add or edit the existing notes.
To add a new note it is recommended that you copy one of the current notes and paste it back in to make sure you are using the correct formatting. Then you can edit that copied note and save your changes.
This new notes should then be seen when going to Notes\Add Notes.