How to add macOS on the external SSD as a new virtual OS

Shuo

Bit poster
I just installed a macOS on external SSD so I can boot up from the external drive then finish some work if the main OS failed and I don't have time to restore the entire system from Time Machine.

But keeping the second OS always new is a pain in the ass, I have to restart the laptop then switch the OS.

Is there a way to add the external macOS as a virtual machine? So that I can run two macOS at the same time without switching the OS so frequently.
 
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