Custom cart items price calculation for Woocommerce Bookings

Solution:

Are you trying to change the price custom way before sending to the cart if yes then you need to send by session the below two hooks will help a lot

add_filter( 'woocommerce_add_cart_item' , 'set_woo_prices');
add_filter( 'woocommerce_get_cart_item_from_session',  'set_session_prices', 20 , 3 );

function set_woo_prices( $woo_data ) {
  session_start();    
  $tac_dd_discounted_price = $_SESSION['']; // get the updated new price field 

  if ( ! isset($tac_dd_discounted_price ) || empty ($tac_dd_discounted_price ) ) { return $woo_data; }
  $woo_data['data']->set_price( $tac_dd_discounted_price );
  $woo_data['my_price'] = $tac_dd_discounted_price;
  return $woo_data;
}

function  set_session_prices ( $woo_data , $values , $key ) {
    if ( ! isset( $woo_data['my_price'] ) || empty ( $woo_data['my_price'] ) ) { return $woo_data; }
    $woo_data['data']->set_price( $woo_data['my_price'] );
    return $woo_data;
}