functions.php

add_action( 'woocommerce_product_options_general_product_data', 'wc_custom_add_custom_fields' );
function wc_custom_add_custom_fields() {
    // Print a custom text field
    woocommerce_wp_text_input( array(
        'id' => '_custom_text_field1',
        'label' => 'Name',
        'description' => ' Field, you can write your Name.',
        'desc_tip' => 'true',      
        'placeholder' => 'Ram'
    ) );
    woocommerce_wp_text_input( array(
        'id' => '_custom_text_field2',
        'label' => 'Location',
        'description' => ' Field, you can write your location.',
        'desc_tip' => 'true',      
        'placeholder' => 'kathmandu'
    ) );
    woocommerce_wp_text_input( array(
        'id' => '_custom_text_field3',
        'label' => 'Telephone no.',
        'description' => 'Field, you can write your contact number.',
        'desc_tip' => 'true',
        'type' => 'tel',
        'placeholder' => '123456'
    ) );
    woocommerce_wp_text_input( array(
        'id' => '_custom_text_field4',
        'label' => 'Acre',
        'description' => ' Field, you can write your land size.',
        'desc_tip' => 'true',
        'type' => 'text',
        'placeholder' => '3 ropani'
    ) );
    woocommerce_wp_text_input( array(
        'id' => '_custom_text_field5',
        'label' => 'Bed Rooms',
        'description' => ' Field, you can write your houses bed rooms.',
        'desc_tip' => 'true',
        'type' => 'text',
        'placeholder' => '5'
    ) );
    woocommerce_wp_text_input( array(
        'id' => '_custom_text_field6',
        'label' => 'Bath Rooms',
        'description' => ' Field, you can write your houses bath rooms.',
        'desc_tip' => 'true',
        'type' => 'text',
        'placeholder' => '4'
    ) );
}