Showing products from child category in parent category shop page
I am trying to figure out how to show products from all child categories in a parent category product listing page.
My categories are (for example):
-Men's (parent category)
--Jackets (child cat.)
--Pants (child cat.)
Right now if I make the Men's category a product listing page, no products show up until I select one of the two child categories when I'm browsing. How do I make it so that all products that are in "Jackets" and "Pants" also by default show in the "Men's" product listing. I know I can go in to the category and manually add in each product, but this would be off the table as I have over 15,000 SKUs in my POS backend and would be inconceivably time consuming. In the POS backend, you can do a product search by parent category and it will show all products of the child categories, so I hope there is a way to work this out in e-commerce.