Here is a deep revision of your code
Fiddle HERE
$(function () {
$("#selections tbody").on('click', function (e) {
var $td = $(e.target);
if ($td.prevAll('td').length === 1) {
var $destiny = $('#destiny'),
// Any row in destiny that would be a clone of the current clicked td's row
// You may want to put an id to make sure it is uniq
$trDestiny = $('tr[rel="' + $td.text() + '"]', $destiny);
// ...
if (!$trDestiny.length) {
// Insert new row ...
}
// else {error handling here}
}
});
});