adding existing image

Hello, I am trying to add physical machine on proxmox. The problem is a data space. However, I converted physical computer to VHDX and than VHDX to qcow2. It's working fine. But hard disk of that computer is 250GB and I do not have space on proxmox - HD space(root) 1.97% (1.86 GiB of 94.37 GiB)...