A company users are part of the organization and they work on projects for the company.
Add Users for a Company
In My Home, Click All Users tab. You can find Company Users, Client Users.
Note:

To add a project user :
This provides access to selected projects. You can add a user to multiple projects at a time.

An invite mail is sent to the new user. Upon subscriping the user is added as part of the project.
Here's sample screen capture of an invite mail sent from Zoho Projects to you.

If you are not able to trace the mail, please do mail us at support@zohoprojects.com for further assistance.

To edit a user :
This saves the latest changes made to the user profile.

To delete a user :
This deletes the project user from the company forever.
