Menus and categories

You can do like that:
www.hikashop.com/en/forum/3-bug-report/2...dGUuaHRtbD9sYW5nPWZy

Yes.
Create a menu item of the type hikashop product page or hikashop products listing or hikashop category listing and use the link of that menu item in your article.

Related products are attached to other products not categories. Please explain what you want to do.

Create a menu item via the menu manager. Then on your front end, click on that menu item. Get the link in your browser's address bar.

Then, for the "related" products, create a products listing module via the modules manager, in the hikashop options of the module, set the option "content on the product page" to "in the same category" and finally, add that module in the "modules under the product page" option of the Display tab of the configuration.