You can create custom application and data software images using the tools available in the Control Center. Typical operations include creating, deploying, updating, and replacing application+data images, and operating environment+application+data images. You can use the Control Center for managing account images. See theN1 Provisioning Server 3.1, Blades Edition, Control Center Management Guide for details on how to create and deploy account images.
Alternatively, you can use the snapshot command-line tool available on the N1 Provisioning Server to take a snapshot of an existing disk for account image creation. See the snapshot man pages for details.