Hey @mostafa_hatem, and welcome to our community 
Indeed, you shouldn’t need 2 differents projects if I understand your use-case correctly.
I’ve answered recently to a thread here, where I explain the flow used to hook 2 databases (MySQL in the case of the thread, but should work the same in your case).
To be clear, we do support multiple database of the same dialect in a single project. If that’s your case, the link above should help.
Otherwise, our smart collection might also be a solution for you.
If I misunderstood your use-case, feel free to detail it a bit more so I can direct you in the right direction.
Let me know if that helps 