Is there a way to update existing subscribers in Mailchimp without adding new subscribers?

I want to add the membership status from Raisers Edge (Active/Lapsed/Dropped) into a group in Mailchimp. I don't want to add the entire Raisers Edge database into mailchimp... just update people who already exist in Mailchimp.

Hi Kelly,
Do your MailChimp Subscribers in Raiser's Edge have their MC ID in the Alias field? If so, you could base the export off a query that only includes people in RE with that Alias type.

Amy