Which volume to split into another APFS for Dual Boot
I want to Dual boot my Mac so that I have Mojave and Catalina on the same device. My Mac is currently running Catalina, and with that it brought 2 volumes: Macintosh HD and Macintosh HD-Data. Which volume do i use to add another APFS Volume to dual boot my mac? Thank you.
MacBook Air 13", macOS 10.15