Hope my understanding is correct, clicking on yellow box will append a clone to the sortable list and it will be sortable as well.
$(function() {
$( "#sortable" ).sortable({
revert: true
});
$( "#draggable" ).draggable({
connectToSortable: "#sortable",
helper: "clone",
revert: "invalid"
}).click(function() {
$(this).clone().appendTo($('#sortable'));
});
$( "ul, li" ).disableSelection();
});