Create resources that yould be shared among products

[Valentina R]

As staff but shared beteen products, so that when one gets booked, it’s still available in the other product.

FYI, this can now be achieved by using this code snippet:

// Make sure common capacity is shared between common products.
add_filter( 'wc_apointments_check_appointment_product', 'common_capacity_between_products', 10, 3 );
function common_capacity_between_products( $return, $appointment_id, $product_id ) {
    $appointment            = get_wc_appointment( $appointment_id );
    $appointment_product_id = (int) $appointment->get_product_id();
    $common_product_ids     = array( 811, 810 ); #product IDs with shared capacity.

    if ( $appointment_product_id !== $product_id && in_array( $product_id, $common_product_ids ) ) {
        return false;
    }

    return $return;
};

// Include all common product IDs inside appointment query.
add_filter( 'woocommerce_appointments_in_date_range_query_args', 'common_product_ids_in_date_range_query_args' );
add_filter( 'woocommerce_appointments_for_objects_query_args', 'common_product_ids_in_date_range_query_args' );
function common_product_ids_in_date_range_query_args( $args ) {
    if ( isset( $args['product_id'] ) && ! empty( $args['product_id'] ) ) {
        $product_ids        = is_array( $args['product_id'] ) ? $args['product_id'] : array( $args['product_id'] );
        $common_product_ids = array( 811, 810 ); #product IDs with shared capacity.

        // Check if queried product ID has shared capacity.
        $common_result = array_intersect( $product_ids, $common_product_ids );
        if ( $common_result ) {
            $args['product_id'] = array_unique( array_merge( $product_ids, $common_product_ids ) );
        }

    }

    return $args;
}

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Requested here and has been asked before.