Migrating from one vCenter Server to another traditionally is tough job.The manual migration approach, which has been done by many VMware Administrators is the most error prone and time consuming. Deploying and configuring a completely new vCenter Server while maintaining your existing one and coming up with a migration plan can be challenging. There are many factors to consider, including but not limited to the size of your environment, number of solutions that use vCenter Server as an endpoint, and how your physical and virtual networks are configured.
In addition, determining a plan of attack for migrating an entire virtual infrastructure from one vCenter Server to another can take some manpower and many late nights. Those days are now over! I’m happy to announce the release of vSphere 6.0 Update 2m (Migration). vSphere 6.0 Update 2m is an automated end to end migration tool from a Windows vCenter Server 5.5 to a vCenter Server Appliance 6.0 Update 2. The manual migration approach, which has been done by many, is the most error prone and time consuming. While the scripted approach reduces time, effort, and minimizes human error it still has its faults like the manual approach. It can be time consuming if the scripting expertise is not currently in-house, learning PowerCLI, and testing to ensure all the moving pieces migrate over correctly. These migration approaches are the same whether migrating to a Windows vCenter Server or the vCenter Server Appliance. Here is the video which explains about this process.
Source: VMware vSphere Blog