It is possible to mark multiple vendors as awarded through Bonfire. Simply follow the usual steps you do when Awarding one vendor (see How do I mark an awarded Vendor?) and repeat for all of the vendors you wish to award.
On your Portal, this is what will be shown:
Once a vendor clicks on the View Opportunity button, they will be able to view the full list of all vendors awarded:
Clicking View Award would give details of each award such as award statements and the date the Project was awarded.