Hi,

You can copy content-single-room.php file in tp-hotel-booking to child theme so you can customize

<?php
    /**
     * hotel_booking_single_room_infomation hook
     */
    do_action( 'hotel_booking_single_room_infomation' );(Remove action)
    /**
     * hotel_booking_single_room_gallery hook
     */
    do_action( 'hotel_booking_single_room_gallery' );
?>
<?php
    /**
     * hotel_booking_after_loop_room hook
     *
     * @hooked hotel_booking_output_room_data_tabs - 10
     * @hooked hotel_booking_upsell_display - 15
     * @hooked hotel_booking_output_related_products - 20 (Remove action)
     */
    do_action( 'hotel_booking_after_single_room' );
?>

Or you can add style css: 

.related_rooms,
.hb_room_pricing_plans{
    display: none;
}