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When I create new product type and extend Bundle, I don`t have "Bundle Items" tab, how I can get the same functionality in my custom product type like in Bundle product?

product_type.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Catalog:etc/product_types.xsd">
<type name="super_bundle" label="Super Bundle Product" modelInstance="VendorModuleModelProductType" composite='true' indexPriority="40" sortOrder="50">
<priceModel instance="MagentoBundleModelProductPrice" />
<indexerModel instance="MagentoBundleModelResourceModelIndexerPrice" />
<stockIndexerModel instance="MagentoBundleModelResourceModelIndexerStock" />
<allowedSelectionTypes>
<type name="virtual" />
</allowedSelectionTypes>
<customAttributes>
<attribute name="refundable" value="true"/>
</customAttributes>
</type>
</config>

When I use

I hope you were both able to Figure out your issue, If not I believe the Following should be the fix.

<vendor>/<module>/etc/product_types.xml:

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Catalog:etc/product_types.xsd">

    <type name="custom_bundle" label="Custom Bundle Product" modelInstance="<vendor><module>ModelProductType" composite='true' indexPriority="40" sortOrder="50">

        <priceModel instance="MagentoBundleModelProductPrice" />

        <indexerModel instance="MagentoBundleModelResourceModelIndexerPrice" />

        <stockIndexerModel instance="MagentoBundleModelResourceModelIndexerStock" />

        <allowedSelectionTypes>

            <type name="simple" />

            <type name="virtual" />

        </allowedSelectionTypes>

        <customAttributes>

            <attribute name="refundable" value="true"/>

        </customAttributes>

    </type>

</config>

<vendor>/<module>/Model/Product/Type.php:

<?php



namespace <vendor><module>ModelProduct;



/**

 * Class Type

 * @package <vendor><module>ModelProduct

 */

class Type extends MagentoBundleModelProductType {



    const TYPE_CODE = 'custom_bundle';



    // Class Intentionally left blank

}

<vendor>/<module>/Setup/InstallData.php:

namespace <vendor><module>Setup;



use MagentoEavSetupEavSetup;

use MagentoEavSetupEavSetupFactory;

use MagentoFrameworkSetupInstallDataInterface;

use MagentoFrameworkSetupModuleContextInterface;

use MagentoFrameworkSetupModuleDataSetupInterface;

use MagentoCatalogModelProduct;

use <vendor><module>ModelProductType as CustomPoductType;



/**

 * Class InstallData

 * @package <vendor><module>Setup

 */

class InstallData implements InstallDataInterface

{

    /**

     * EAV setup factory

     *

     * @var EavSetupFactory

     */

    private $eavSetupFactory;



    /**

     * Init

     *

     * @param EavSetupFactory $eavSetupFactory

     */

    public function __construct(EavSetupFactory $eavSetupFactory)

    {

        $this->eavSetupFactory = $eavSetupFactory;

    }



    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)

    {

        /** @var EavSetup $eavSetup */

        $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);



        $fieldList = [

            'price',

            'special_price',

            'special_from_date',

            'special_to_date',

            'minimal_price',

            'cost',

            'tier_price',

            'weight',

            'price_type',

            'sku_type',

            'weight_type',

            'price_view',

            'shipment_type',

        ];



        foreach ($fieldList as $field) {

            $applyTo = explode(',', $eavSetup->getAttribute(Product::ENTITY, $field, 'apply_to'));



            if (!in_array(CustomPoductType::TYPE_CODE, $applyTo)) {

                $applyTo = CustomPoductType::TYPE_CODE;

                $eavSetup->updateAttribute(

                    Product::ENTITY,

                    $field,

                    'apply_to',

                    implode(',', $applyTo)

                );

            }

        }

    }

}

From your question i think the main part you are missing is the EAV Attributes assignment. if you were to take a look at the Magento_Bundle module Setup/InstallData.php you will see that this has a list of existing attributes that it assigns plus creates some new ones, it is the new attributes that are required, specifically shipment_type for the highlighted area in the screenshot.