I Need to create multi level of subgroups in organic groups like
like a tree. I don't know how to create using organic groups. Can anyone suggest.
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Apparently, there is a module for this: Subgroups for Organic groups
According to the module description,
This module enables a user with the proper permissions to build group hierarchies (or tree) by nesting groups under other groups. Simple or complex group hierarchies can be easily created.
Assuming you already have organic groups installed and working:
That's all you need to do.
Additionally, installing og_groups module enables propagation of settings, permissions etc. It is only needed if you want to so do.
If you want to see the tree hierarchically, you made need to create views using somethign like views_tree