I have company documents library folder in my parent site. I would like it to list the documents from a department(sub site) within the company site(parent site).
Is there a step by step tutorial to do this?
As per your requirement I think you can use Content Query WebPart/Content Search WebPart for the same. Because Content Query WebPart has a property to display data from Sub site too.
Your question might be answered here
Let me know if this solves your problem or you need some more assists.