Can a user belong to multiple companies

In some cases you can have a user who is affiliated to several companies, in example, an accountant or a part time employee having multiple jobs. 

If this employee is already registered in Portal in another company, you will be notified when adding this user to Portal. You'll get the message "This user already exists". 

Do the following:

1. Click Admin in the menu on the left. 
2. Select Users. 
   
3. Click New user. 
4. Enter the email address and then click any other field.
5. A pop-up box will appear that says "Existing user". 
6. Activate the checkbox if you will notify the user with an invite email.
7. Hit Add. 
8. The user information will be retrieved automatically. 
9. Hit Save.