Looking into the tables, nested categories doesn't look to be supported. You could try submitting this to SI Voices, but one alternative would be to make Multiple groups with sub-grouped names. Example:


Music - General
Music - Michael Jackson
Music - Elvis Presley
etc.

Thinking further on it, though, wouldn't it just be easier to have a music category and then make the fan page yourself? Otherwise it implies having multiple sub-groups of that one artist.

Hi ousia,

I am really sorry for the delay of this reply as it is a weekend for us here.

Yes, unfortunately that was not possible at this point of time. Perhaps you can request this feature from our voice page http://stackideas.com/voices/easysocial as David suggested at above.