Yes is possible.
You need to contact directly the producers you want and book the visit. Check in this forum for deeper informations (there are many treads about it).
Alternatively you can check on the website of the consortium the list of producers and send them an e-mail: consorzio Parmigiano-Reggiano, consorzio aceto balsamico tradizionale di Modena , consorzio prosciutto di Parma.
-:- Message from TripAdvisor staff -:-
This topic has been closed to new posts due to inactivity. We hope you'll join the conversation by posting to an open topic or starting a new one.
To review the TripAdvisor Forums Posting Guidelines, please follow this link: http://www.tripadvisor.com/pages/forums_posting_guidelines.html
We remove posts that do not follow our posting guidelines, and we reserve the right to remove any post for any reason.