Plugin- set additonal options

<?xml version="1.0"?> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd"> <type name="Magento\Quote\Model\Quote\Item\ToOrderItem"> <plugin name="unique_name" type="Vendor\ModuleName\Plugin\ToOrderItem" sortOrder="1" /> </type> </config> 

<?php namespace Vendor\ModuleName\Plugin; use Magento\Quote\Model\Quote\Item\ToOrderItem as QuoteToOrderItem; class ToOrderItem { /** * aroundConvert * * @param QuoteToOrderItem $subject * @param \Closure $proceed * @param \Magento\Quote\Model\Quote\Item $item * @param array $data * * @return \Magento\Sales\Model\Order\Item */ public function aroundConvert( QuoteToOrderItem $subject, \Closure $proceed, $item, $data = [] ) { // Get Order Item $orderItem = $proceed($item, $data); // Get Quote Item's additional Options $additionalOptions = $item->getOptionByCode('additional_options'); // Check if there is any additional options in Quote Item if ($additionalOptions->getValue()) { // Get Order Item's other options $options = $orderItem->getProductOptions(); // Set additional options to Order Item $options['additional_options'] = json_decode($additionalOptions->getValue()); $orderItem->setProductOptions($options); } return $orderItem; } }