Changing a Client company on a project
If you'd like to change the Client company you're working with at any point, go to "Set up people", scroll down, and look for the "Change the client on this project" link at the bottom:
Changing the Client on a project won’t affect the Client people you’ve already added, it only changes the Client company labels throughout the project.
Type the new Client name in, hit Enter, and save your changes: