add_action('frm_after_create_entry', 'create_entry_after_submission', 60, 2);

function create_entry_after_submission($entry_id, $form_id){
    if ( $form_id != 2 ) { //ID of Form A
        return;
    }
	//Get the initial form entry and find the post_id of the post created by this entry.
	$entry = FrmEntry::getOne( $entry_id ); 
	if ( ! $entry->post_id ) {
			return;
		}

    $form2 = '4'; //ID of Form B
    //Get user  
    if (!isset($_POST['frm_user_id'])){
        return;
    }
    $user = $_POST['frm_user_id'];
    //get data
    if (!isset($_POST['item_meta'][84])){ //84 is the field ID of the Form A value
        return;
    }
	
    $studio_post_id = $entry->post_id; //assign the post_id to this variable
    $artist_name = $_POST['item_meta'][84];
    $artist_description = $_POST['item_meta'][229];
    //create entry
    FrmEntry::create(array(
        'form_id' => $form2,
        'item_key' => $user . $entry_id,
        'frm_user_id' => $user,
	'item_name' => $artist_name,
        'item_meta' => array(
             171 => $user,
             225 => $studio_post_id,//Put the post_id into the correct field of the new form entry
	     98 => $artist_name,
	     121 => $artist_description,
        ),
    ));
}