You can extract individual objects from a group without separating all objects in the group.
To remove objects
Perform the following operations:
Select the Edit tool
.-
Press and hold SHIFT and click on the objects to be extracted from the group.
-
Choose the Graph » Group » Remove command or click the
button in the toolbar.
The objects removed from the group maintain the order of reciprocal overlap and are placed immediately above the group from which they come.