Hi Steven Lancaster,
Unfortunately the meta fields for each generic content provider are available for all items in it. In this line of thought you cannot have one blog having certain set of meta fields and another blog having another set of meta fields. In order to have this you will have to add another Blogs provider to your collection of Generic Contentent based providers. Then for this provider you will be able to define the meta fields which you want to use.
Otherwise, you can add new meta fields to your blogs, and not necessarily set them for each blog post. For more information on how to introduce new meta fields to modules you can check this help article: Add Custom Meta Fields
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