Custom SubTotal for coupon

/*
  Note: using multiple bookings mode

  1. paste this snippet at the end of your theme functions.php
  OR
  2. using ftp, go to wp-content then create new folder name mu-plugins and then open this folder and
  3. create new php file name functions.php then edit and paste this snippet > save
  4. go to Events > Bookings and under Recent Bookings click on the Gear Icon and Drag new 'Sub Total' to the left
 */

function my_em_bookings_table_cols_template_subtotal($template, $EM_Bookings_Table){
	$template['sub_total'] = 'Sub Total';
	return $template;
}
add_action('em_bookings_table_cols_template', 'my_em_bookings_table_cols_template_subtotal',10,2);

function my_em_custom_booking_form_cols_subtotal($val, $col, $EM_Booking, $EM_Bookings_Table, $csv){

	if( $col == 'sub_total' ){
		if( get_option('dbem_multiple_bookings') ){
			$EM_Multiple_Booking = EM_Multiple_Bookings::get_main_booking($EM_Booking);
			if( $EM_Multiple_Booking !== false ){
				$EM_Booking = $EM_Multiple_Booking;
			}
		}
		$val = em_get_currency_formatted($EM_Booking->booking_price);
	}

	return $val;
}
add_filter('em_bookings_table_rows_col','my_em_custom_booking_form_cols_subtotal', 10, 5);