Tracking subscriptions on a lead
We would like to create a subscription management center. I understand how to set up a form to allow people to specify their preferences going forward. But, I am wondering: how do we get this information to track on the Marketo lead? Do we need to create custom fields to track subscription preferences?
Also, is there a way to import a list of people who have previously opted in to emails and have them all marked as opt-in for a particular type of email?