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Steps for adding custom fields to products 
Go to the Toolset → Dashboard  page and click the Add custom fields  in the row for Products . Click to select the type of the custom field you want to create first. In the dialog that appears, type in the name of your field. The slug is created automatically. Set other options for your custom field such as description, validation, etc. Different types of fields have different options. 
Adding custom fields to WooCommerce products 
 
When you’re done adding all fields you need, click the Save Field Group  button.
Your group of custom fields will now appear when creating or editing products.
Custom fields in a product edit screen