This article will create the simple view that will display the sugroups of current group.
I have written an article for creating the subgroup of groups: http://mohitaghera.drupalgardens.com/content/creating-subgroup-organic-groups
Actually i have used the default view provided by the organic group module, but have made a little tweak like changing the content type and etc..
You can directly import the view for the usign.
$view = new view();
$view->name = 'og_subgroups';
$view->description = 'Show all content (nodes) of a group.';
$view->tag = 'og';