How to simultaneously open pages from different places in the hierarchy in the desktop app?

We have a desktop app where user has to enter information on different pages.

All pages in the app are placed in a hierarchy. For example:

  • Item 1
    • Item 1.1
    • Item 1.2
  • Item 2
    • Item 2.1

But you can also open Item 1.1 from Item 3.

Sometimes user needs to open different pages simultaneously. For example, to copy information from one item to another.

How can the user open different pages simultaneously and still see his place in the hierarchy, and the way the user took to get to this page?

In the website we have tabs that are not connected to the web-site navigation. But this is not the web, but an app. Has anyone encountered this problem?

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