Custom Field for specific product

I have a poduct in my store that I want people to be able to customize such as adding a number, I would like that if an answer to a question is yes(do you want a custom number on product), for a text field (or something) to appear and customer can add a number in there for a custom order.

• This topic was modified 3 years, 6 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Developing with WordPress topic