This is actually covered in SnapCenter 4.0 under a different guide name: Importing Data from SnapManager to SnapCenter
Refer guide here:
https://library.netapp.com/ecm/ecm_download_file/ECMLP2840890
For VMware workload, this is covered under heading "Migrating VSC hosts" as part of the "Installation and Setup Guide"
Refer guide here:
https://library.netapp.com/ecm/ecm_download_file/ECMLP2840879
There is also an import utility for migrating VSC (SMVI) workload to SCV and VSC released called: NetApp Import Utility for SnapCenter and Virtual Storage Console
Link: https://mysupport.netapp.com/tools/info/ECMLP2840096I.html?productID=62135&pcfContentID=ECMLP2840096
SCV-VSC-Import-README.pdf covers all the necessary details bundled along with the zip file.