To rename the netbios name of a OES host or a cluster resource, perform the following:
Leave the domain. For more information, see Leave a AD Domain.
Using iManager, rename the netbios name also known as CIFS Virtual Server Name. For more information, see Setting CIFS General Server Parameters in the OES 2018 SP3: OES CIFS for Linux Administration Guide.
Reconfigure NSS AD. For more information, see Reconfiguring NSS AD.