Bootable installer
Before I install Catalina I want to make a bootable installer on a USB drive. I have a 32 GB drive with High Sierra and Mojave installers. The drive is about equally split between the two installers, although each one is about 6 or 7 GB in size. So there is plenty of room for the third installer. The terminal command to make the installer will erase the drive. Can I use Disk Utility to partition the drive into thirds, without erasing either of the bootable installers? And then will the terminal command point to the empty partition?
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled -- /Applications/Install\ macOS\ Catalina.app
Or should Untitled be named something else?