すでにカスタムがされている問合せフォームに
さらに項目「配送希望日・納期」「配送先の都道府県名」を追加しました。

LC_Page_Contact_Ex.phpに項目追加

/**
     * Page のプロセス.
     *
     * @return void
     */
    function process() {
        global $objCampaignSess;

        $conn = new SC_DBConn();
        $this->objView = new SC_SiteView();
        $objCampaignSess = new SC_CampaignSession();
        $objDb = new SC_Helper_DB_Ex();
        $CONF = $objDb->sf_getBasisData();			// 店舗基本情報
        SC_Utils_Ex::sfDomainSessionStart();

        $objCustomer = new SC_Customer();

        $this->arrData = isset($_SESSION['customer']) ? $_SESSION['customer'] : "";

        // レイアウトデザインを取得
        $layout = new SC_Helper_PageLayout_Ex();
        $layout->sfGetPageLayout($this, false, DEF_LAYOUT);

        //フォーム値変換用カラム
        $arrConvertColumn = array(
        /*#お問い合わせに対象商品名# ADD BEGIN*/
                                     array(  "column" => "target_name",	"convert" => "aKV" ),
        /*#お問い合わせに対象商品名# ADD END*/
        /*#お問い合わせに法人項目# ADD BEGIN*/
                                     array(  "column" => "company_name",		"convert" => "aKV" ),
                                     array(  "column" => "company_name_kana",		"convert" => "CKV" ),
        /*#お問い合わせに法人項目# ADD END*/                                     
                                     array(  "column" => "name01",		"convert" => "aKV" ),
                                     array(  "column" => "name02",		"convert" => "aKV" ),
                                     array(  "column" => "kana01",		"convert" => "CKV" ),
                                     array(  "column" => "kana02",		"convert" => "CKV" ),
                                     array(  "column" => "zip01",		"convert" => "n" ),
                                     array(  "column" => "zip02",		"convert" => "n" ),
                                     array(  "column" => "pref",		"convert" => "n" ),
                                     array(  "column" => "addr01",		"convert" => "aKV" ),
                                     array(  "column" => "addr02",		"convert" => "aKV" ),
                                     array(  "column" => "email",		"convert" => "a" ),
                                     array(  "column" => "email02",		"convert" => "a" ),
                                     array(  "column" => "tel01",		"convert" => "n" ),
                                     array(  "column" => "tel02",		"convert" => "n" ),
                                     array(  "column" => "tel03",		"convert" => "n" ),
        /*#お問い合わせに項目追加# ADD BEGIN*/
                                     array(  "column" => "date",		"convert" => "aKV" ),
                                     array(  "column" => "pref2",		"convert" => "aKV" ),
        /*#お問い合わせに項目追加# ADD END*/ 
                                     array(  "column" => "contents",   "convert" => "aKV")
                                  );

        if (!isset($_POST['mode'])) $_POST['mode'] = "";

        switch ($_POST['mode']) {
            case 'confirm':
            // エラーチェック
            $this->arrForm = $_POST;
            $this->arrForm['email']   = isset($_POST['email']) ? strtolower($_POST['email']) : '';
            $this->arrForm['email02'] = isset($_POST['email02']) ? strtolower($_POST['email02']) : '';
            $this->arrForm = $this->lfConvertParam($this->arrForm,$arrConvertColumn);
            $this->arrErr = $this->lfErrorCheck($this->arrForm);
            if ( ! $this->arrErr ){
                // エラー無しで完了画面
                $this->tpl_mainpage = 'contact/confirm.tpl';
                $this->tpl_title = 'お問い合わせ(確認ページ)';
            } else {
                foreach ($arrConvertColumn as $key) {
                    $this->$key['column'] = $this->arrForm[$key['column']];
                }
            }
            break;

            case 'return':
                foreach ($arrConvertColumn as $key) {
                    $this->$key['column'] = $_POST[$key['column']];
                }
            break;

            case 'complete':
            $this->arrForm = $_POST;
            $this->arrForm['email'] = strtolower($_POST['email']);
            $this->arrForm = $this->lfConvertParam($this->arrForm,$arrConvertColumn);
            $this->arrErr = $this->lfErrorCheck($this->arrForm);
            if(!$this->arrErr) {
                $this->lfSendMail($CONF, $this);
                // 完了ページへ移動する
                $this->sendRedirect($this->getLocation("./complete.php", array(), true));
                exit;
            } else {
                SC_Utils_Ex::sfDispSiteError(CUSTOMER_ERROR);
            }
            break;

            default:
            break;
        }

        //----　ページ表示
        $this->objView->assignobj($this);
        // フレームを選択(キャンペーンページから遷移なら変更)
        $objCampaignSess->pageView($this->objView);
    }

    /**
     * デストラクタ.
     *
     * @return void
     */
    function destroy() {
        parent::destroy();
    }
    
    // }}}
    // {{{ protected functions

    //エラーチェック処理部
    function lfErrorCheck($array) {
        $objErr = new SC_CheckError($array);
        /*#お問い合わせに法人項目# ADD BEGIN*/
        $objErr->doFunc(array("法人名", 'company_name', STEXT_LEN), array("SPTAB_CHECK","MAX_LENGTH_CHECK"));
        $objErr->doFunc(array("法人フリガナ", 'company_name_kana', STEXT_LEN), array("SPTAB_CHECK","MAX_LENGTH_CHECK", "KANA_CHECK"));
        /*#お問い合わせに法人項目# ADD END*/
        $objErr->doFunc(array("お名前(姓)", 'name01', STEXT_LEN), array("SPTAB_CHECK","MAX_LENGTH_CHECK"));
        $objErr->doFunc(array("お名前(名)", 'name02', STEXT_LEN), array("SPTAB_CHECK","MAX_LENGTH_CHECK"));
        $objErr->doFunc(array("フリガナ(セイ)", 'kana01', STEXT_LEN), array("SPTAB_CHECK","MAX_LENGTH_CHECK", "KANA_CHECK"));
        $objErr->doFunc(array("フリガナ(メイ)", 'kana02', STEXT_LEN), array("SPTAB_CHECK","MAX_LENGTH_CHECK", "KANA_CHECK"));
        $objErr->doFunc(array("郵便番号1", "zip01", ZIP01_LEN ) ,array("SPTAB_CHECK" ,"NUM_CHECK", "NUM_COUNT_CHECK"));
        $objErr->doFunc(array("郵便番号2", "zip02", ZIP02_LEN ) ,array("SPTAB_CHECK" ,"NUM_CHECK", "NUM_COUNT_CHECK"));
        $objErr->doFunc(array("ご住所1", "addr01", MTEXT_LEN), array("SPTAB_CHECK" ,"MAX_LENGTH_CHECK"));
        $objErr->doFunc(array("ご住所2", "addr02", MTEXT_LEN), array("SPTAB_CHECK" ,"MAX_LENGTH_CHECK"));
        $objErr->doFunc(array("お問い合わせ内容", "contents", MLTEXT_LEN), array("EXIST_CHECK", "MAX_LENGTH_CHECK"));
        $objErr->doFunc(array('メールアドレス', "email", MTEXT_LEN) ,array("EXIST_CHECK", "EMAIL_CHECK", "EMAIL_CHAR_CHECK", "MAX_LENGTH_CHECK"));
        $objErr->doFunc(array('メールアドレス(確認)', "email02", MTEXT_LEN) ,array("EXIST_CHECK", "EMAIL_CHECK", "EMAIL_CHAR_CHECK", "MAX_LENGTH_CHECK"));
        $objErr->doFunc(array('メールアドレス', 'メールアドレス(確認)', "email", "email02") ,array("EQUAL_CHECK"));
        $objErr->doFunc(array("お電話番号1", 'tel01', TEL_ITEM_LEN), array("NUM_CHECK", "MAX_LENGTH_CHECK"));
        $objErr->doFunc(array("お電話番号2", 'tel02', TEL_ITEM_LEN), array("NUM_CHECK", "MAX_LENGTH_CHECK"));
        $objErr->doFunc(array("お電話番号3", 'tel03', TEL_ITEM_LEN), array("NUM_CHECK", "MAX_LENGTH_CHECK"));
        /*#お問い合わせに項目追加# ADD BEGIN*/
        $objErr->doFunc(array("配送希望日", 'date', STEXT_LEN), array("EXIST_CHECK","SPTAB_CHECK","MAX_LENGTH_CHECK"));
        $objErr->doFunc(array("配送先の県名", 'pref2', STEXT_LEN), array("EXIST_CHECK","SPTAB_CHECK","MAX_LENGTH_CHECK"));
        /*#お問い合わせに項目追加# ADD END*/

        if (REVIEW_ALLOW_URL == false) {
            // URLの入力を禁止
            $masterData = new SC_DB_MasterData_Ex();
            $objErr->doFunc(array("URL", "contents", $masterData->getMasterData("mtb_review_deny_url")), array("PROHIBITED_STR_CHECK"));
        }

        return $objErr->arrErr;
    }  

フロントの表示
contact/index.tpl

      <!--{*#お問い合わせに項目追加# ADD BEGIN*}-->
      <th>配送希望日・納期<span class="attention">※</span></th>
      <td>
        <span class="attention"><!--{$arrErr.date}--></span>
        <input type="text"
               class="box120"
               name="date"
               value="<!--{$date|escape}-->"
               maxlength="50"
               style="<!--{$arrErr.date|sfGetErrorColor}-->" />
      </td>
      </tr>
      <th>配送先の都道府県名<span class="attention">※</span></th>
      <td>
        <p>例：埼玉県</p>
        <span class="attention"><!--{$arrErr.pref2}--></span>
        <input type="text"
               class="box60"
               name="pref2"
               value="<!--{$pref2|escape}-->"
               maxlength="50"
               style="<!--{$arrErr.pref2|sfGetErrorColor}-->" />
      </td>
      </tr>
      <!--{*#お問い合わせに項目追加# ADD END*}-->

contact/confirm.tpl

        <!--{*#お問い合わせに項目追加# ADD BEGIN*}-->
        <tr>
          <th>配送希望日・納期<span class="attention">※</span></th>
          <td><!--{$arrForm.date|escape}--></td>
        </tr>
        <tr>
          <th>配送先の都道府県名<span class="attention">※</span></th>
          <td><!--{$arrForm.pref2|escape}--></td>
        </tr>
        <!--{*#お問い合わせに項目追加# ADD END*}-->