Confluence Dashboard page

Dear,

We would like to create a structured dashboard page in which projects are structured/related to each other.

• project A
  --subproject A1
  ---comon header page
  ---detail pages
  --subproject A2
  ---common header page
  ---detail pages
• project B
  --subproject B1
  ---common header page
  ---detail pages

Project A1 and B1 are based on the same project template definition. subproject A2 is based on another project template definition.

Depending on the user permissions, the user can see project A and project B or only one of them but with the full sublevels.

Project A1 and B1 has the same pagenames, the header part of those projects contains the same structure.

So, I think, we have to define all the projects on the same level but is there a way to 'manipulate' the dashboard in order to create some kind of structure or categorisation of the projects?

Thank you in advance for your feedback.