How to install the macOS Catalina beta in its own APFS container

You can have your Catalina and still be Mojave fresh.

With the public beta out for macOS 10.15 Catalina, you might be a thrill seeker and want to test out the in-progress version. But maybe you’d like to hedge your bets. In the past, you’d need to partition your startup drive, which could turn into a lot of effort, or get an external drive—preferably SSD—and install and boot from that.

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https://www.macworld.com/article/3405588/how-to-install-the-macos-catalina-beta-in-its-own-apfs-container.html