I am thinking the most likely approach is in admin: 1. Product Options: Option Groups tab, Add new group of a textbox type. Make it 'Required'. 2. Edit a product. On the Options tab, for Add new option, select the textbox just created. Fill in the rest (Negative, Price, etc) and click the green circle with the white plus in it to add it to the list of options. Click the Save and Reload button. 3. Make sure this new option is enabled in the product's list of options. Make it plain i