vboxmanage-export
Export virtual machines to a virtual appliance (ISO) or a cloud service.
TLDR
Specify the target OVA file
$ VBoxManage export --output [path/to/filename.ova]
Export in OVF 0.9 legacy mode
$ VBoxManage export --legacy09
Export in OVF (0.9|1.0|2.0) format
$ VBoxManage export --[ovf09|ovf10|ovf20]
Create manifest of the exported files
$ VBoxManage export --manifest
Specify a description of the VM
$ VBoxManage export --description "[vm_description]"