If you have the posts linked already I think you’d just need to update the field in the relationship posts when the post is saved.
I used update_field() and ACF/save_post
I’ve done something similar in a solution I built to update the field values of a specific post from any page on the website.
function update_variant_fields($post_id) {
// Get related Base Cards using the relationship field
$base_cards = get_field('base_card_relationship_field', $post_id);
if ($base_cards) {
foreach ($base_cards as $base_card_post) {
$power = get_field('power', $post_id);
$cost = get_field('cost', $post_id);
update_field('power', $power, $base_card_post->ID);
update_field('cost', $cost, $base_card_post->ID);
}
}
}
add_action('acf/save_post', 'update_variant_fields'); // Update on post save
I realized after I made it could have probably changed $base_card_post->ID into its own variable.
Hope this helps!
