From what I know and can see in terms of available workflows I don't think that is an option. I know it's possible to push data from the OA project to the NS Opportunity but there isn't a workflow as standard that would allow you to directly configure pulling data from the Opportunity record. Having said that there are so many back end switches that enable different functionality within OpenAir I would recommend asking support. The OA Project to NS Opportunity workflow itself is only available once turned on in the back end by support.