Run the basic.sh script and choose install. Create a virtual disk image and add that to the basic.sh script. This even allows you to choose which version you want. Examples of when you may need to use the Mac Startup Manager include booting to your Windows Boot Camp partition, booting to a complete cloned backup of your system drive, or reinstalling.
As long as the Mac is compatible with the operating system contained on the selected drive, your Mac will continue booting the designated operating system.
