Document Library – Our conceptual hierarchy can not be created. Errors "Terms can not be shared multiple times in the same term set."

We want to build our Term Store to show how we manage our folder structure. Currently, our folder structure in the main document library has the following hierarchy:

1) HR Dept
  - General Document
     * External 
     * Internal
  - Policies
     * External
     * Internal
     * Private

2) IT
  - General Document
    * Outlook 
    * SharePoint
        * Admin
        * Development
    * Office 365
  - Policies
    * Private

Now I want to create our term store to represent the above hierarchy. For example, if users upload a document to the IT >> Generic Document >> Outlook folder, you can select the term as follows:

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Even if users want to know all documents that are "Private" (added under a folder named "Private"), they can do so by filtering the documents with the term "Private", which will retrieve all documents that are "Private" under any "private" are department.

But I face the following problem, is that I can not reuse the shared expressions more than once within the same phrase.
For example, I have created a term set that represents the common terms (I call it a template) as follows:

Enter image description here

However, I can not reuse the terms of the template more than once, e.g. As shown in the picture above. I would like to reuse the terms "Private" and "Public" under the IT and HR terms, but if I try to use the term more than once I get this error: –
Enter image description here

Can someone give me advice on this topic? As I mentioned earlier, I would like to reuse the same term in different departments so that users can filter the documents based on the term, e.g. For example, retrieve all documents that are private throughout the department. If I now create two terms named "Private" and add them to 2 sections, I can not filter the documents using the same term under different departments.