Adding people from the same organization or company to projects
To add a bunch of people from the same company to your project at once, go to "Set up people", then click the "Or pick people from a company" dropdown and select the company you’d like to add people from:
After that, choose people from that company to be added to the project:
Once you have added those users, you can change their participation type to decide how they get notified of updates to the project:
Only team users can invite others to a project. Clients cannot invite anyone to their projects. See permissions for more detailed information.