Version 1.5.0 of Product Extras for WooCommerce features a couple of important new features plus some fixes and updates.
Discount prices in WooCommerce Addons
Product Extras is a WooCommerce Addons plugin, allowing you to add extra fields to your products that the user can configure. Fields include text, number, file upload, checkboxes, etc.
Although you could always assign an additional price to an addon field, you couldn’t previously give it a negative value – until now. With version 1.5.0, you can allow a user to select a checkbox option that will reduce the price by a figure you specify.
Alternatively, you could create a select dropdown field where some options increase the product price when selected, but others might reduce the product price if selected.
Set default values
You can also now set default values for some fields. For example, you can insert default text in a text field or set a checkbox to be selected.