You can try to update it by hand... It may work. I think it would be:
</li>
<li><a href="<?php echo($assumedRoot); ?>training.php">Training</a>
<ul class="level-1">
<li><a href="<?php echo($assumedRoot); ?>corporate_training.php">Corporate</a>
<ul class="level-2">
<li><a href="<?php echo($assumedRoot); ?>newlink.php">New link</a></li>
</ul>
</li>
<li><a href="<?php echo($assumedRoot); ?>drug_alcohol_training.php">Drug & Alcohol</a></li>
<li><a href="<?php echo($assumedRoot); ?>highways_training.php">Highways</a></li>
<li><a href="<?php echo($assumedRoot); ?>police_training.php">Police</a></li>
</ul>
</li>