SYSTEM
OS: Debian Linux 4.18.0-3-amd64
CPU: AMD Ryzen 7 1700 Eight-Core Processor
VirtualBox: virtualbox-5.2 : 5.2.20-125813~Ubuntu~bionic

STEP
1. CREATE VM
2. MODIFY VM
3. BOOT INSTALLER
4. BOOT NEW OS
5. CREATE NEXT VERSION CDR INSTALLER
6. FIX VirtualBox NOT SUPPORT apfs IN High Sierra/Mojave

1. CREATE VM
General
Machine -> New
Name="NAME OF VM"
Type=Mac OS X
Version=Mac OS X (64-bit)

Storage
HDD=NEW VDI DISK IMAGE (20-60G)
CD=CDR INSTALLER