To grant the "Exchange-Admins" and "Administrators" groups permission to control the "MSExchangeSA" service, you could run the command below:
SecurSvc MSExchangeSA Exchange-Admins Administrators
To grant the local "Administrators" group and the domain group MyDomain\SNMP-Admins permissions to control the "SNMP" service, you could run this command:
SecurSvc SNMP Administrator MyDomain\SNMP-Admins
To grant the local "Administrators" group to control the "SNMP" service, you could run this command:
SecurSvc SNMP Administrators