In this article I will cover setting up your first two Global Managers and adding the local managers from your sites.
Log into the newly deployed Global Manager

System > Configuration > location Manager
Make Active

Provide the name of your Global Manager

Confirm the GM is active

SSH into the Global Manager
Run the #get certificate api thumbprint
Store this output somewhere
Repeat this for your NSX-T Global Manager in location 1 and location 2

Now it is time to deploy the standby Global Manager
Add standby

Enter the name of the new GM
Provide the FQDN of the standby GM
Admin username
Copy the standby site NSX-T GM thumbprint here

Then check compatibility

Confirm the managers

Next we need to add the onprem location for the first site – my example Dallas

Enter the name for the first site local manager
Provide the FQDN for the NSX-T manager for location 1
Copy the thumbprint for location 1 NSX-T manager

Click check compatibility

Ignore this error as it will go away when the LM syncs with the GM – takes around 5-15 minutes

Rinse and repeat to add in your second location – my example is FortWorth

Next we need to import objects to the GM