You don't want the Import command, that's something else (I don't recall exactly what it does off the top of my head and don't want to give misleading information, so I'll leave it at that).
We share a common file format between our hosted products, you should be able to just open the virtual machine in Fusion, no need for conversion or importing or creating a new virtual machine with the old disks or anything. The only trick is that Fusion is the only one to use .vmwarevm bundles (because other platforms don't have a concept of bundles), so you want to direct Fusion at the .vmx config file.