Learn more about Project Guests
Project Guests can only be added within a project. Only Admins and Budget Managers are allowed to invite Project Guests depending on your team's permission settings.
Navigate to the Project you want to add the Project Guest. Click + on the top, then click Invite Member.
Enter the first name, last name and email for the guest. Select Project Guest as the Membership.
Click send invite. The guest can follow the normal activation process to activate his account.