I have an existing site that displays videos, with multiple post types that utilize relationships. State - County - City - Video.
Each video has been assigned to the specific city, county, and state where it took place.
I now have added a new post type for Country, and created the first post of this type, USA.
I added the states to USA manually. But there are several hundred counties, cities, and videos. Is there a way I can assign each of these to USA in bulk? I'd like to do this now, before we begin adding other Countries. 100% of all posts belong to USA right now.
This site was developed when the original Relationships structure was active, and it has never been migrated to the new style because it wasn't needed. I don't know if that would make a difference now.