first upload all files

Modules/FlashSale/Admin/FlashSaleTabs.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Modules\FlashSale\Admin;
+
+use Modules\Admin\Ui\Tab;
+use Modules\Admin\Ui\Tabs;
+
+class FlashSaleTabs extends Tabs
+{
+    /**
+     * Indicate that submit button should add offset class.
+     *
+     * @var bool
+     */
+    protected $buttonOffset = false;
+
+    public function make()
+    {
+        $this->group('flash_sale_information', trans('flashsale::flash_sales.tabs.group.flash_sale_information'))
+            ->active()
+            ->add($this->products())
+            ->add($this->settings());
+    }
+
+    private function products()
+    {
+        return tap(new Tab('products', trans('flashsale::flash_sales.tabs.products')), function (Tab $tab) {
+            $tab->active();
+            $tab->weight(5);
+
+            $tab->fields([
+                'products.*.product_id',
+                'products.*.end_date',
+                'products.*.price',
+                'products.*.quantity',
+            ]);
+
+            $tab->view('flashsale::admin.flash_sales.tabs.products');
+        });
+    }
+
+    private function settings()
+    {
+        return tap(new Tab('settings', trans('flashsale::flash_sales.tabs.settings')), function (Tab $tab) {
+            $tab->weight(10);
+            $tab->fields(['campaign_name']);
+            $tab->view('flashsale::admin.flash_sales.tabs.settings');
+        });
+    }
+}