$cat_posts = new WP_Query([
'cat' => $cat->term_id,
'posts_per_page' => 100
]);<?php foreach ($cats as $cat) : ?>
<?php
$cat_posts = new WP_Query([
'cat' => $cat->term_id,
'posts_per_page' => 100
]);
?>
<?php if ($cat_posts->have_posts()) : while ($cat_posts->have_posts()) : $cat_posts->the_post(); ?>
<a href="<?php the_permalink();?>" class="category-link"><?php the_title(); ?></a>
<?php endwhile; endif; ?>
<?php wp_reset_postdata(); ?>
<?php endforeach; ?>
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<article class="entry-content">
<h1 class="content-headline"><?php the_title(); ?></h1>
</article>
<?php endwhile; endif; ?>
Заявка - это не товар, рассматривай её как order