A question about setting up custom taxonomy

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Setting up custom taxonomy correctly is something i’m still having some trouble getting my head around and was hoping someone might be able to clear this up for me…

i’m working on a site where the user can submit a review of a business. there are only about 30 of these businesses spread over 5 different regions/districts.

i have a custom post type of ‘reviews’…
i have a custom taxonomy attached which has the names of all the businesses.

when a user is filling the review there is a select dropdown populated from the custom taxonomy and list all the businesses.

so far, so good… the review is submitted with the correct business taxonomy attached to it.

now, i want to separate these businesses by region/district.how can i do that without forcing the user to choose a region?

for example, on the Reviews archive page i have a filter where you can show just reviews from a specific business, but i would like it so that you can also filter by region, and it would show reviews for all businesses within that region…

ideally, i’d also like for when the user is filling out a review first they’d choose region and then they’d choose from a list of businesses just from that region.

can anyone help me with how i can i can organise this ?

cheers

D

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