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1. Import the simple product.
2. Set Customizable Options for the product.

1. Import simple product

• Prepare the import file.
• Import product to Magento.

2. Add customizable options for the product

 On the admin sidebar, go to Catalog > Product.

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 Go to Products page, find the product to edit, then click on Edit under Action column.

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 On the product detail page, expand the Customizable Options section. 

• Click on Add Option button to add product options.
• Option Title: Enter the option title.
• Option Type: Select the option display in the drop-down list. There are three options: drop-down, radio buttons, checkbox.
• Set the additional options on the below table.
  • Title: Enter the name for each option.
  • Price: Set the additional price for each option. If there is no additional price, enter the value 0.

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Drop-down

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Radio buttons

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Checkbox

 After finish, click Save button on the top right to save the changes.

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