About System Image Utility on Mac
You can use System Image Utility on your Mac (located in /System/Library/CoreServices/Applications/) to create two main types of images:
Custom network images that contain an operating system
Operating system-free images that contain configuration profiles, scripts, and packages
To learn about the kinds of images you can create, see Types of images.
To learn about creating packages, see Add software to images.
To learn about creating configuration profiles, see the macOS Deployment Reference.
System Image Utility images offer you alternatives for managing the operating system and apps that your Mac computers require to start (or boot) and do their work. Instead of going from computer to computer to install macOS and other software, you can prepare an entire image that installs on each similar Mac when it starts up. You can also choose to not install software and have Mac computers start up from a network image stored on the server. (In some cases, Mac computers don’t even need their own internal storage device.)
Important: You must have a valid macOS license for each Mac that starts from a NetBoot, NetInstall, or NetRestore network image. You must also have all the necessary license agreements to install apps, books, and fonts on multiple Mac computers.
You can also use Automator at any time to view a current workflow or create a new workflow. The basic building block of a System Image Utility workflow is an Automator system action. You define the network image customization by building Automator system actions into a workflow when you use System Image Utility. By combining several system actions into a workflow, you can quickly accomplish a specific task that no one action can accomplish on its own.
Click Customize at any time in System Image Utility to open Automator and view the current workflow. You must quit Automator and relaunch it to see any updates you’ve made with System Image Utility.