Copy a default template into this custom folder and edit as you wish.
Eg: Copy "/App_Data/Templates/Notifications/RIA-Route.html" to "/App_Data/Templates/Notifications/Custom/RIA-Route.html"

When looking for templates EWA will check the custom folder first and then use the default if a custom template doesn't exist.

To create AppPage specific templates simlpy copy a default template to the custom folder and append a dash and the pages urlName.
Eg: Copy "/App_Data/Templates/Notifications/RIA-Route.html" to "/App_Data/Templates/Notifications/Custom/RIA-Route-MFDScanning.html"
