Custom Fields

[N41RD4]

Hello

I need help with something that I'm programming.

It turns out that I want to buy when the customer can get a custom field. I give you an example: I buy a bracelet and want to record the name, because I want to say that name with that font, if it is centered or bold, etc. (custom fields).

The clearest example is in this web:

http://www.sello-digital.com/b2c/index.php?page=pp_producto.php&md=0&ref=Fechador+Professional+5460

There is a module already done or could be created from 0? I have no problem to program.

Thank you very much in advance.