Hi @Edward Ver
Welcome to the forum and the world of ProcessWire.
Please try the following code. Please note the comments to see if you get the idea.
<?php $showcase = $pages->find("template=work_details") ?>
<?php foreach($showcase as $showcases): ?>
<div>
<?php foreach($showcases->work_hero_repeater as $whr): ?> // You need to loop therough the repeater because repeater is an arrray.
<p class="pb-2 text-left"><?= $whr->work_hero_subheading ?></p> // Then call the field in the repeater item as you need"
<?php endforeach; ?>
</div>
<?php endforeach; ?>
Gideon