Yes, you can award multiple vendors in Bonfire via the Award tool. 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.
If you have the Past Public Opportunities feature enabled, you will see the awarded vendors as follows on the opportunity page:
Clicking View Award would give details of each award such as award statements and the date the Project was awarded.