Here is what i found works for renaming a default group, as you cannot create more groups beyond what is there.
SequenceId,Priority,UserName,GroupName,Action,ValueName,Value1,Value2,Value3,DateTime,MessageNo,ComputerNames,AppId,Status
1,1,,Group 100,210,,BPM,,,,0,,,0
2,2,,Group 101,210,,CHANNEL SECURE OPS,,,,0,,,0
3,3,,Group 102,210,,CISCO CNC,,,,0,,,0
4,4,,Group 103,210,,CISCO NOS,,,,0,,,0
5,5,,Group 104,210,,CTS,,,,0,,,0
6,6,,Group 105,210,,DCI,,,,0,,,0
line 1
Rename "Group 100" to named group "BPM" using code 210 to perform the Action
Gerald