How to add (Remaining Stock, Sale Price USD, Promotion Price, Image)

$page_security = "SA_ITEM";
$path_to_root = "../..";
include_once($path_to_root . "/includes/session.inc");
include_once($path_to_root . "/includes/ui.inc");
include_once($path_to_root . "/inventory/includes/db/items_db.inc");

$mode = get_company_pref('no_item_list');
if ($mode != 0)
    $js = get_js_set_combo_item();
else
    $js = get_js_select_combo_item();

page(_($help_context = "Items"), true, false, "", $js);

if(get_post("search")) {
  $Ajax->activate("item_tbl");
}

start_form(false, false, $_SERVER['PHP_SELF'] . "?" . $_SERVER['QUERY_STRING']);

start_table(TABLESTYLE_NOBORDER);

start_row();

text_cells(_("Description"), "description");
submit_cells("search", _("Search"), "", _("Search items"), "default");

end_row();

end_table();

end_form();

div_start("item_tbl");
start_table(TABLESTYLE);

$th = array("", _("No"), _("Item Code"), _("Description"), _("Category"), _("Remaining Stock"), _("Sale Price USD"), _("Promotion Price"), _("Image"));
table_header($th);

$k = 0;
$name = $_GET["client_id"];
$result = get_items_search(get_post("description"), @$_GET['type']);

while ($myrow = db_fetch_assoc($result))
{
    alt_table_row_color($k);
    $value = $myrow['item_code'];
    if ($mode != 0) {
        $text = $myrow['description'];
          ahref_cell(_("Select"), 'javascript:void(0)', '', 'setComboItem(window.opener.document, "'.$name.'",  "'.$value.'", "'.$text.'")');
    }
    else {
          ahref_cell(_("Select"), 'javascript:void(0)', '', 'selectComboItem(window.opener.document, "'.$name.'", "'.$value.'")');
    }
    label_cell($showid);
      label_cell($myrow["item_code"]);
    label_cell($myrow["description"]);
      label_cell($myrow["category"]);
    label_cell($myrow['???']);
    label_cell($myrow['???']);
    label_cell($myrow['???']);
        label_cell($myrow['???']);
    end_row();
}

end_table(1);

div_end();
end_page(true);