Create Custom Option Programmatically in Magento 2

To create custom options in a product programmatically you need to use the following code:

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$productId = 1;
        $_product = $objectManager->create('Magento\Catalog\Api\ProductRepositoryInterface')->getById($productId, true);
        $options = [
            [
                'title' => 'drop_down option',
                'type' => 'drop_down',
                'is_require' => true,
                'sort_order' => 4,
                'values' => [
                    [
                        'title' => 'drop_down option 1',
                        'price' => 10,
                        'price_type' => 'fixed',
                        'sku' => 'drop_down option 1 sku',
                        'sort_order' => 1,
                    ],
                    [
                        'title' => 'drop_down option 2',
                        'price' => 20,
                        'price_type' => 'fixed',
                        'sku' => 'drop_down option 2 sku',
                        'sort_order' => 2,
                    ],
                ],
            ]
        ];
        
        foreach ($options as $arrayOption) {
            $option = $objectManager->create(\Magento\Catalog\Model\Product\Option::class)
                ->setProductId($_product->getId())
                ->setStoreId($_product->getStoreId())
                ->addData($arrayOption);
            $option->save();
            $_product->addOption($option);
            $objectManager->create('Magento\Catalog\Api\ProductRepositoryInterface')->save($_product);
        }

Here,

$options: is an array holds multiple custom options.

Once this code is executed, the custom options of types: field, drop down and multi select are created in your product.

Screenshot:

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