pewc_start_group.php

<?php
/**
 * Open a new div to wrap multiple groups
 * Ensure you update the group ID
 */
function prefix_open_group_wrapper( $group_id, $group, $group_index ) {
	if( $group_id == 455 ) {
		echo '<div class="my-group-wrapper">';
	}
}
add_action( 'pewc_start_group', 'prefix_open_group_wrapper', 10, 3 );

/**
 * Close the div
 * Ensure you update the group ID
 */
function prefix_close_group_wrapper( $group_id, $group, $group_index ) {
	if( $group_id == 457 ) {
		echo '</div><!-- close my-group-wrapper -->';
	}
}
add_action( 'pewc_end_group', 'prefix_close_group_wrapper', 10, 3 );