I need a possibility to add some constants (fix values) to a existing price at any product item. I use the plugin 'Measurement Price Calculator' and I'm handling my product items via 'product variations'.
For example: The user could see a select box or a group of radio buttons with fix values: option1 = +1 Dollar, option2 = +2 Dollar, etc.
Is there a extension for my desire? Or a built-in option?
Thanks for any help!