Can I unsubscribe from my list of addresses that have bounced without deleting them altogether?

Hi,

I am new to Constant Contact and in checking a campaign I noticed that some 400 email addresses had bounced and most of those were recommended for removal.  However, I don't want to delete them altogether but rather just "park" them in unsubscribed.   From my filtered list of those recommended for removal -- there is no drop down item on the action list that would allow me to unsubscribe -- only to delete altogether.   Other than going one contact at time from the main contact list... how can I filter and unsubscribe all those identified as recommended for removal, while not deleting them altogther.  

Thank you.