Convert vmware stanalone converter, vmdk upload proxmox server, create new virtual machine

qemu-img convert -f vmdk /mnt/usb/windows-server/windows-server.vmdk -O qcow2 /var/lib/vz/images/100/windows-server.qcow2

edit virtual machine config file and attach converted disk file

nano /etc/pve/local/qemu-server/100.conf