Open Graph Objects - assign multiple categories to an object?

Hey there. I have been using JFB Connect on a few web sites for a while and I think it's a good extension even if it's lacking in some areas.

Now I'd also like to install it on several of my clients' web sites, primarily to control Open Graph. For example, I want to use the Full Article Image in Joomla as og:image and Meta Description as og:description.

However many of these web sites have dozens of categories and thousands of articles and I find it very tedious and a waste of time to create an Open Graph object per category on so many sites. We're talking hundreds of categories altogether.

Would it be possible to create ONE object and assign it to several categories instead?

I like Joomla's approach on module assignment (All, None, Only on selected, On all except selected) - something like that would be really nice also for Open Graph objects, imo. Any chance for a quick fix on this?

Thanks Alex. I wasn't aware that it would work as a hierarchy but that certainly helps!