dose anyone know the keyboard shortcut for group and ungroup with AutoCAD 2012?   Thanks !

is there a way to ungroup multiple different groups at the same time ? 

You can define your own shortcuts for indiviual commands and menu macros. See CUI and the command [CMD]-GROUP[/CMD]. Plus there is the Ctrl+Shift+A keyboard shortcut as the group selection mode toggle.
 
See also the GRP utility:
http://www.cadforum.cz/cadforum_en/qaID.asp?tip=6287Vladimir Michl2011-08-18 13:46:29