So I have been meaning to do an update and found this and its great for anyone not wanting to do it the other method that I had posted about setting up your SSD as a boot drive on the Raspberry Pi 4 check it out.
You can download the Berryboot files here:
To install: extract the contents of the .zip file to a normal (FAT formatted) SD card, and put it in your Raspberry Pi. This can be simply done under Windows without any special image writer software.
Once you start your Pi it will start an installer that reformats the SD card and downloads the operating systems files from the Internet.
alternative method to add ssd boot to your pi4:
You can also check out My Time with the Raspberry Pi 4 as a Desktop Which is always being updated.