Introduce Iconic:

Add Custom Fields to Your WooCommerce Product Variations
Save time editing product variations and give customers the information they need with WooCommerce Custom Fields for Variations.

Main Feature Iconic:

• Field groups
  Organise your new data fields and group them under separate headings.
• Unlimited fields
  Add any number of custom fields to your WooCommerce product variations.
• Field Types
  Support for text, textarea, select, checkboxes, or radio buttons field types.
• Seamless
  Works with any well-coded theme and adopts the native WooCommerce admin and theme styling.