In System -> Processor tab, select the processor number that you assign to the mac os virtual machine.
In the macOS Settings window, click the System item in the left panel, then in the right panel click Motherboard tab -> Boot Order list, uncheck Floppy checkbox.Select the newly created mac os virtual machine in the left list panel, then click the Settings icon in the top bar to open the virtual machine settings window.
The configuration includes system motherboard & processor, display video memory, choose mac os iso file in storage, and network mapping method. Now the macOS virtual machine has been created, and then we need to do some settings for it. 2.2 Configure macOS Virtual Machine To Install macOS Mojave Or High Sierra. Then it will go to the virtual machine list window, you can see the newly created virtual machine in the left panel, and it’s status is Powered Off.
Whether you want to install mac os high sierra or Mojave, you should prepare the high sierra or Mojave iso file first, please read the article How To Download MacOS X High Sierra Installer In Mojave, How To Download macOS Mojave Installer And Convert To ISO File.First, you should install VirtualBox, this is very straightforward in windows, you can just download VirtualBox and install it.