So you want to get a child group out of a parent group? Have you tried opening the parent group and using Edit>Cut to remove it? Then close the parent group and choose either Edit>Paste or Edit>Paste in place to put the child group out on its own.
[image: a8sU_Screenshot-8_1_20154_09_33PM.jpg]
[image: dEQ6_Screenshot-8_1_20154_10_04PM.jpg]
You could also just select the child group in Outliner and drag it out of the parent group.