Sub Groups (nested)

Hi everyone. I am new to Elgg having used joomla in the past.
I need to find out if you can create sub groups under groups. I.e. Say you have a group concerning Cars. I would then propose sub groups of all the different makes of cars relevant to Cars i.e. Aston Martin, Volvo, BMW etc. Members could then join the sub group say Aston Martin. Is it then possible to create a further sub sub group say Cars>  Aston Martin>  DB9, DB7 AMV8 etc?

Thanks Chris