Hi! check these docs: https://docs.railway.com/guides/projects#transferring-projects

Per my account which is Hobby I can't invite any user to my project

Hobby accounts can invite users to their projects, where are you seeing that you cannot?

The station reports that you are currently still on a Free plan.
Unsure if you have yet to upgrade or not 😁

😀😀 I have pro account and a hobby account

You do indeed. Then I am curious to know where you are being told that you cannot add users as project members?

I figured it out

After the transfer of the project to the pro plan, will the projects be charge separately? or at once?

If separately how do I move the project to a new environment to the other project so they are charge once?