How to make projects show in right page?

Hi, 

I have many projects(check link), in the navigation bar i named them: Project 1, Project 2 and Project 3...,
My question is, how can i make Project 1 only show projects which belows to Project 1? 
And projects 2 only show projects which belongs to projects 3.

See attachments  :https://prnt.sc/lpoy4l ;            (every project contain the same items, this is not right!)
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