Tell us what you are trying to do?
Edit a product in WooCommerce and define taxonomy items that are setup. I can add categories from this custom taxonomy 'Brands' if I bulk edit products however the option does not show on single edit product pages.
Is there any documentation that you are following?
No. Cannot find anything on this problem.
Not sure what is happening on your end but when I added the custom taxonomy to my Woocommerce products they work fine on the edit page for the product.
Could you try temporarily disabling all the non-toolset plugins and trying again ?
That's quite odd, would you mind allowing me to have admin access to the website so that I can have a look ? Also I may need to grab a copy of your website.