The “Import Third-Party Reviews” tool pretty basic at the moment. It allows you to import reviews, but not review assignments.
If you are asking if there is a way to import reviews along with their assignments, then this is not currently possible. You would have to import reviews in batches (according to their assignments), and then bulk assign the reviews after each import.
If you are not referring to “importing reviews” but just want to import a bunch of categories, then I would first ask what the purpose of this is for. If each of these categories are representing a product on your website, why not just assign reviews directly to the products themselves?
You can do this dynamically with the assigned_posts="post_id"
option. Using post_id
as the value will automatically use the Post ID of the current page (or product).