Trigger post submit button in wordpress post

Question

i create a new post within a post with wp_insert_post and ajax - all working as expected

my workflow :

• edit post#1
• create a new post within post#1
• open in new tab the new post (post #2)

so what i'm trying to achieve :

• trigger submit button in post#1 (because if the user has made some changes before click the create post button -> post #2)

I think this action must take place in add_action('wp_ajax_save_post_details', 'save_form_action'); if there's no is_wp_error -> success

Hope i'm clear