For this implementation NSX Manager and vCenter Server have a one-to-one relationship. For every instance of NSX Manager, there is one connected vCenter Server. 

First assign a domain service account that NSX uses to the vCenter Server Administrator role. After that deploy the NSX Manager virtual appliance for the management cluster. After the NSX Manager is deployed connect it to the Management vCenter Server instance.

1

Assign a domain service account for use by NSX to access the vCenter Server Administrator role.

2

After you deploy the NSX Manager virtual appliance for the management cluster, you connect the NSX Manager to the Management vCenter Server.

3

Assign the administrator@vsphere.local account access to NSX.