The "bulk edit" function allows you to update interests, nurture campaigns, consent and subscriptions for many contacts at once.
Step 1: Select contacts
Filter your contact list to narrow down your list to contacts you want to update. You can filter the list in many ways. For example view contacts that belong to a list, view results of a filter or click on a drill-down metric in a report.
Step 2: Click the "Group edit" button
Step 3: Apply changes
Follow the on-screen instructions to apply changes to the selected contacts.