steveostudios

This widget only works on a Woocommerce single product page. When it is placed there, it will parse the <code>Category location</code> (set in the widget’s settings) for the any subcategories of the parent category. It will then list the best sellers, by subcategory, in widget form.
Here is an example case: We have mutliple authors that each have tons of products. Product categories are as follows: 
– Books 
 – fiction 
 – nonfiction 
– Authors 
 – Author 1 
 – Author 2 
 – Author 3
In our case, our widget’s <code>Category location</code> is <code>Authors</code> (the category). When you go to a product filed in <code>Author 1</code>, in the sidebar, all of Author 1’s other products are listed in order of best selling.
If there is more than one category that it falls under, it will list them all. It ignores the current product. It also hide itself if this is the only product in that subcategory.

Woocommerce Category Best Seller Widget

Widget that displays a specified number of best sellers in the same category.

suifengtec

This is a WordPress Widget that displays a specified number of best sold products by the same vendor in the same category on the single/vendor page,and displays a specified number of best sold products in the same category on others page.
If there is more than one category that it falls under, it will list them all. It ignores the current product. It also hide itself if this is the only product in that subcategory. Notice: 
Recommended used with a multi-seller woocommerce add-on,More info:<a href="http://suoling.net/woocommerce-hot-products-by-category-and-vendor" rel="nofollow ugc">“More Info” </a>

Woocommerce Hot products by Category and Vendor

Widget that displays a specified number of hot products(sold by current vendor)in the same category(on the product page or vendor's shop page).

Woocommerce Category Best Seller Widget vs Woocommerce Hot products by Category and Vendor