Woocommerce shopping cart column

[admin]

How add custom column to woocommerce shopping cart and then add info of some input from this column to order, checkout page and to email?
Actually i need add friends list from buddypress to each product row(price must depends on how many friends checked).
Here i found suggestion, but it`s partly helpfull <a href="https://stackoverflow.com/questions/21650019/woocommerce-add-input-field-to-every-item-in-cart">WooCommerce: Add input field to every item in cart</a>
wp community also keep silence
<a href="http://wordpress.org/support/topic/woocommerce-custom-column-in-cart?replies=1" rel="nofollow noreferrer">http://wordpress.org/support/topic/woocommerce-custom-column-in-cart?replies=1</a>

what i do - its just add list of avalaible friends and no idea how can I save data on update cart or proceed.

if ( bp_has_members( 'user_id=' . bp_loggedin_user_id() ) ){
                        function ggUserFrom(){
                            $arrUsers = array();
                            while ( bp_members() ){
                                bp_the_member();
                                $arrUsers[ bp_get_member_user_nicename() ] = bp_get_member_user_nicename();
                            }
                            return $arrUsers;
                        }

                        echo "<div class='friends-holder'>";
                        foreach ( ggUserFrom() as $friend ){
                            echo '<p><input type="checkbox"  name="cart['.$cart_item_key.'][friendsfromcart]" value="'.$friend.'">
                            <span>'.$friend.'</span></p>';
                        }
                        echo "</div>";
                    }

Im seek ANY info about this question.