- Create a new empty VM in Proxmox, matching the specs of the original. Note the VMID for the fourth step
- Export .vmdk from XOA
- SCP the .vmdk to the Proxmox host
- qm importdisk - this will convert the .vmdk to a raw file
- The disk image should now be attached to the VM you created at the start
- Boot the VM and tweak settings as needed