inform multiple product custom fields

[ksilenio]

Hi
I'd like to ask how can i will inform 10 different products custom fields with new one
I explain
I have 10 different products with some custom fields and i want to add a new custom field which is the same in all products
Is there any special procedure or have to added one by one manually? Or there is anything else (3rd party extension)?

Thank you for your time ksilenio
PS I know there is a "parent" or "child" structure and i don't want like this because the products already exists

[balai]

You can go either manualy or to use an extension for massive products update like CSVI.
Also for better management of the custom fields you can use Custom Fields For All