Hi @Rob Diagramson, 

I'm afraid Miro doesn't have such functionality at the moment. But I see you're not alone looking for such feature, a similar Wish List idea was submitted not so long ago: Bulk board upload and transfer between accounts - feel free to upvote it to raise the awareness of our Product team. Also, don't forget to share your use case in the thread, so we have all the necessary details for the research!

Hopefully, we'll get a chance to make this flow more user-friendly for you in the future :)