With Devila plugin “Woocommerce Up-sells Products Both Sides”, the public product page show all the up-sells products related to that product (in both sides).
Every product that has product A between up-sells products, will be showed like (up-sells) related product of product A in the public page.
You don’t need anymore to related product A with product B and Product B with Product A to see the relation in the relative product A and B pages.
With “Woocommerce Related Products Both Sides” plugin you have only to relate product A with product B one time.