I tried many ways, but it doesn't seems to work...
1. I created a new project, and checked the "Based on Existing Project". Results: it doesn't import none of the requirements (nor the tasks)
2. I exported the requirements from project A to project B. Results: I only exported the requirements, BUT didn't export their corresponding tasks.
3. I made a copy of a Project A. Result: The new copy has only the requirement of the original... NO Tasks copied.
4. I also exported the tasks from Project A to project B. Results: The task did migrate, but they weren't linked to their corresponding requirements--even when I did export the requirements before hand.