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1. Identify the table you want to create a custom field for. 
2. Create the new custom field for the table. 
3. Edit a table's record to include the new data.
4. (For product or category custom fields only) Display the field on your website. Add the product field widget to theProduct Detail and/or Product List templates. For a category field, add the category field widget to the Category template. See: Add Custom Field to Product or Category

Step-by-step guide

1. Create a New Custom Field  

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