How to show different forms in different tabs Admin custom module ?

Hello Guys,

I have just stuck to show the forms for each tabs, can any one provide me some hint or reference link.

here is my tabs.php

$this->addTab(
                'backend',
                [
                    'label' => __('Backend'),
                    //'content' => $this->_translateHtml($this->getLayout()->createBlock('Ocodewire\Designtool\Block\Adminhtml\Pattern\Edit\Tab\Backend')->toHtml()),
                    'url' => $this->getUrl('*/*/backend', ['_current' => true]),                   
                    'group_code' => self::BASIC_TAB_GROUP_CODE
                ]
            );

            $this->addTab(
                'upsell',
                [
                    'label' => __('Left Sleeve'),
                    'url' => $this->getUrl('*/*/backend', ['_current' => true]),                   
                    'group_code' => self::BASIC_TAB_GROUP_CODE
                ]

  

  );