Add custom dropdown (with options) to Shipping tab on add product form.

Hello,
You can use the following snippet to add the shipping method field under shipping tab and saving that data in product meta-

add_filter( 'wcfm_product_manage_fields_shipping', function($shipping_fields, $product_id) {
    if ( apply_filters( 'wcfm_is_allow_shipping', true ) ) {
        $shipping_method_options = array(
            'royal_mail' => 'Royal Mail',
            'dpd'        => 'DPD',
            'other'      => 'Other Courier'
        );
        $shipping_method = get_post_meta( $product_id, 'wcfm_custom_shipping_method', true );
        $shipping_fields['wcfm_custom_shipping_method'] = array( 'label' => __( 'Shipping method', 'wc-frontend-manager' ), 'type' => 'select', 'options' => $shipping_method_options, 'class' => 'wcfm-select wcfm_ele simple variable booking', 'label_class' => 'wcfm_title', 'value' => $shipping_method );
    }
    return $shipping_fields;
}, 10, 2 );

add_action( 'after_wcfm_products_manage_meta_save', function( $product_id, $form_data ) {
    if ( apply_filters( 'wcfm_is_allow_shipping', true ) ) {
        if ( isset( $form_data['wcfm_custom_shipping_method'] ) ) {
            update_post_meta( $product_id, 'wcfm_custom_shipping_method', $form_data['wcfm_custom_shipping_method'] );
        }
    }
}, 150, 2 );

there is another part of your query that involves showing this method under shipping cost. Now if there is more than 1 product in the cart and both have different method set, what you want to show then? Do you have a layout in mind?
Let me know.
Thanks!

Sorry I didn’t get your requirement. There are many possibilities and you provide too little information. And the example you shared makes it more confusing (Postage: Royal Mail).
Our current code adds a dropdown field under Shipping tab. Now I can write a shortcode where you need to provide the product id and it will show the corresponding shipping method like this [postage product_id=”25″] //output a string value- Royal Mail/DPD /Other Courier
But if you want this field in dropdown and like to save the value, then it will not be possible. Because then it can be used anywhere in the website and thus we could not determine which saving hook we’ll use to save that data.
Please specify your requirements in more detail.
Thanks!

Hello,
Use the following snippet-

function get_product_shipping_method( $attr ) {
    global $wcfm, $post;
    $product = '';
    if ( ! empty( $attr['id'] ) ) {
        $product = wc_get_product( absint( $attr['id'] ) );
    }
    if ( ! $product && is_product() ) {
        $product = wc_get_product();
    }
    if ( ! $product )
        return '';

    $shipping_method = wcfm_get_post_meta( $product->get_id(), 'wcfm_custom_shipping_method' );
    return $shipping_method ? 'Postage: ' . ucwords( str_replace( '_', ' ', $shipping_method ) ) : '';
}

add_shortcode( 'shipping_method', 'get_product_shipping_method' );

Usage –
[shipping_method] //inside a single product page
[shipping_method id=”PRODUCT_ID”] //anywhere in the website

let me know how it goes.