vboxmanage-clonevm
Create a clone of an existing virtual machine (VM).
TLDR
Clone the specified VM
$ VBoxManage clonevm [vm_name]
Specify a new name for the new VM
$ VBoxManage clonevm [vm_name] --name [new_vm_name]
Indicate the folder where the new VM configuration is saved
$ VBoxManage clonevm [vm_name] --basefolder [path/to/directory]
Register the cloned VM in VirtualBox
$ VBoxManage clonevm [vm_name] --register