jQuery UI library does not include the ability to drag and drop items in a new nested list under an existing item as would be expected by the user. This is a bug rather than a feature because it is possible for the user to UN-nest all items, but it is NOT possible to RE-nest them in the same way.

Expected/desired functionality:

http://www.bernardopadua.com/nestedSortables/test/nested_sortable/

1. Can drag all items anywhere you want

2. You can place any item to be nested under any other existing item by moving it to the right of the item just under the item you want it to be nested under

Above example based on the old "interface" library for previous versions of jQuery.

Actual functionality:

http://dev.jquery.com/view/tags/ui/1.5b2/demos/ui.sortable.html

1. Can drag all nested items to top level (flat list) or at the same level as another nested item

2. Attempting to place items under another one does not work

Based on the newest version of jQuery using UI 1.5b2