Hoe to create a space as tree structure, containing various sub-spaces

[Giorgia Acerbi]

How can I create a tree structure, where putting a set of sub-pages? Each sub-page should be a page with a document. On the bar on the left I would just want to click on the name of the sub-page and to be linked at it.

[Thomas Schlegel]

Hmm, do you want to create sub-pages or sub-spaces? The headline does not match with the text of your question.

[Giorgia Acerbi]

You are right, sorry.. Well, actually I am new using Confluence and I'm trying to set up a sort of structure in which I can put a set of documents.

Using the lateral bar I would expect to see a list of pages. Clicking on one of them, I would like to have another list of pages. The idea is to have a tree structure, and probably, the best solution would be having sub-pages, each of them with a particular document.

I hope it is more clear now :)

Thank you for your answer!

[Thomas Schlegel]

Another important question for answering questions about a Confluence page tree: 

do you have Confluence Server or Confluence Cloud?