Programmatically: How to create custom Magento product attributes

Step 1: Create a new module

Create a new directory in the app/code/local directory, e.g., MyCompany/MyModule. Inside this directory, create the following files: etc/config.xml etc/system.xml Model/Setup.php

Step 2: Define the module configuration

In etc/config.xml, add the following code:

		
	
    
        
            1.0.0
        
    
	
	

Step 3: Define the attribute setup

In etc/system.xml, add the following code:

		
		\system xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Setup/etc/system_config.xsd">
		
        
            
             
                
                My Custom Attribute
             
                
                My Custom Field
			    text
                10
                
             
             
             
		     
        
		
		
	

Step 4: Create the attribute setup script

In Model/Setup.php, add the following code:

	namespace MyCompany\MyModule\Model;

	use Magento\Framework\Setup\InstallDataInterface;
	use Magento\Framework\Setup\ModuleContextInterface;
	use Magento\Eav\Model\Entity\Attribute\Setup as EavSetup;

	class Setup implements InstallDataInterface
 {
    private $eavSetup;

    public function __construct(EavSetup $eavSetup)
    {
        $this->eavSetup = $eavSetup;
    }

    public function install(ModuleContextInterface $context)
    {
        $this->eavSetup->addAttribute(
            \Magento\Catalog\Api\Data\ProductInterface::ENTITY_TYPE,
            'my_custom_attribute',
            [
                'type' => 'text',
                'label' => 'My Custom Attribute',
                'input' => 'text',
                'visible' => true,
                'required' => false,
                'user_defined' => true,
                'sort_order' => 100,
            ]
        );
    }
	}
	

Step 5: Register the setup script

In etc/module.xml, add the following code:

		
	
    
        
            
                MyCompany_MyModule_Model_Setup
            
        
    
	
	

Step 6: Run the setup script

To run the setup script, navigate to the Magento admin panel and go to System > Tools > Dataflow > Run Wizard. Select "Run" and then "Yes" to execute the script.