the question is what you want to achieve. (vmware does not change the size of the disk seen in the guest. it just reorganizes the compressed vmdk files)
I have a Windows XP VM with a qcow2 Disk that have 100 GB Space assigned.
I used 80 GB of the 100 GB in the VM. But after i delete the big Files, i use only 10 GB in the VM, but the qcow2 File is still 80GB big. I want to shrink the Disk so that the qcow2 Disk is also 10GB big....