I used it to clone the SD card onto my SSD drive as part of the boot-from-SSD project. There is such an application it's called Raspberry Pi imager. If you want to try this on your own, start with the second video to get a general sense of what you're working with, then look at the first for doing it with BerryBoot. Unfortunately, this didn't work it was meant for a single booting installation, and BerryBoot needs a bit more modification.

I should mention that I started out with the instructions in this video. I am now writing from Raspberry Pi OS on a 120 GB SSD. Once I did the cmdline.txt modification correctly, it worked. At that point you can shut down, remove the SD card, and boot.

The key is to first set up your SD card, then add the necessary firmware to allow booting from USB (if you don't already have), to modify the cmdline.txt file on your SD card, and to image the SD card onto the usb drive you want to boot from.

The main source of information for how to do this was: here. It wasn't easy, at least it wasn't easy using BerryBoot, which I wanted to use in order to have multiboot capabilities. I have finally set up my Pi 4 to boot directly from an SSD plugged into my USB 3 port, with no SD card installed.

Berryboot zero install fail