04-06-2013 04:12 PM - edited 04-06-2013 04:21 PM
You can use the free add-on, Xact Bulk Opportunities Updater, available here http://www.freeactaddons.com/ . This is an ACT! plugin which adds an option under the tools menu to update the status, process and stage of all the opportunities in the current opportunity lookup.
Hope that helps