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There is no much documentation about the duplication of a project in TAC.
I tried and the new project is empty. If I want an empty project I will add a project I won't duplicate an existing project.
According to you this is the normal behaviour of this functionnality ?
That seems to be the functionality. I'm not able to port any components from other projects with it as well. To copy components from an existing project, you would have to export items from the project and import them into the new project. That seems to work well.