I found my answer from another site after hours of searching! – http://wpquestions.com/question/showChrono/id/10819
<?php
// List posts by the terms for a custom taxonomy of any post type
$post_type="product";
$tax = 'products';
$tax_args = array(
'order' => 'DESC',
'parent' => 0
);
// get all the first level terms only
$tax_terms = get_terms( $tax, $tax_args );
if ($tax_terms) {
foreach ($tax_terms as $tax_term) { // foreach first level term
// print the parent heading
?>
<h4 class="parent-term"><?php echo $tax_term->name; ?></h4>
<?php
// get all its children
$child_terms = ""; // first ensure this var is empty
$child_terms = get_terms ( $tax, array('order' => 'DESC', 'parent' => $tax_term->term_id) );
// store an array of child terms slug
$child_terms_array = array();
foreach ($child_terms as $child_term){
$child_terms_array[] = $child_term->slug;
}
// first of all, print the posts of the parent, but excluding the one which are also into a child term
$parent_args="";
$parent_args = array(
'post_type' => $post_type,
'tax_query' => array(
'relation' => 'AND',
array(
'taxonomy' => $tax,
'field' => 'slug',
'terms' => $tax_term->slug,
'include_children' => false,
'operator' => 'IN'
),
array(
'taxonomy' => $tax,
'field' => 'slug',
'terms' => $child_terms_array,
'include_children' => false,
'operator' => 'NOT IN'
)
),
'post_status' => 'publish',
'posts_per_page' => 6,
'order' => 'ASC',
);
// query the posts
$parent_query = null;
$parent_query = new WP_Query($parent_args);
if( $parent_query->have_posts() ) : ?>
<ul>
<?php while ( $parent_query->have_posts() ) : $parent_query->the_post(); ?>
<li><a href="https://wordpress.stackexchange.com/questions/203667/<?php the_permalink() ?>">
<?php the_title(); ?>
</a>
</li>
<?php endwhile; // end of loop ?>
</ul>
<?php endif; // if have_posts()
wp_reset_query();
// if any, foreach child term, query the posts
if ( !empty($child_terms) ){
foreach ($child_terms as $child_term){
$child_args="";
$child_args = array(
'post_type' => $post_type,
'tax_query' => array(
array(
'taxonomy' => $tax,
'field' => 'slug',
'terms' => $child_term->slug,
'include_children' => false,
'operator' => 'IN'
)
),
'post_status' => 'publish',
'posts_per_page' => 6,
'order' => 'ASC',
);
// query the posts
$child_query = null;
$child_query = new WP_Query($child_args);
if( $child_query->have_posts() ) : ?>
<h4 class="child-term"><?php echo $child_term->name; ?></h4>
<ul>
<?php while ( $child_query->have_posts() ) : $child_query->the_post(); ?>
<li><a href="https://wordpress.stackexchange.com/questions/203667/<?php the_permalink() ?>">
<?php the_title(); ?>
</a>
</li>
<?php endwhile; // end of loop ?>
</ul>
<?php endif; // if have_posts()
wp_reset_query();
} // end foreach #child_terms
}
} // end foreach #parent_term
}
?>