Ungroups
the objects under a group node.
Edit > Ungroup > 
Ungroup Under
Ungroup objects under one of the following:
- Parent
-
Puts all objects under
their lowest common parent in the hierarchy. If there is none, then
it puts the objects as the world level.
- World
-
Puts all objects at world
level (at the top-level of the hierarchy).
- Preserve Position
-
When on, Maya preserves the transformation information
of the group. If off, the ungrouped objects lose their grouped transformation attributes,
therefore changing their position when ungrouped.
