I wanted to change my Environment to reflect my blog
Easy way to create DNS with the power CLI
Add-DnsServerResourceRecordA -Name vcsa01 -IPv4Address 192.168.1.10 -ZoneName virtsysadmin.lab
Refer following for more commands
https://woshub.com/create-manage-dns-zones-records-powershell/
Changing FQDN for VCSA was easy, As long as DNS is created it's straight forward.
https://blogs.vmware.com/vsphere/2019/08/changing-your-vcenter-servers-fqdn.html
Login to the VAMI using port 5480,
-> Networking -> Network settings -> Edit -> Select Network Adapter -> Edit settings ->
change the host name
or the IP
Need to acknowledge the following after providing the SSO credentials.
After some time you will prompt to login to the VAMI using new URL.
Login to the vCenter using new URL and change any previous reference. 
In a production Environment
- Take a snapshot of the VCSA (offline snapshots in a ELM setup - https://kb.vmware.com/s/article/85662)
- Get the change Approve
- Inform stake holders
- Specially update the Monitoring Team / Tool to reflect the change.
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