On the Project menu, under Project Team, select Project Groups.
Click on the Project Group name in the listing.
Optional: Add Contacts
Click the Import Company/Contact button shown to the right of the Group Contacts section.
Click the checkbox next to company/contact to be added.
Click the Add or Add and Close button at the bottom of the form. This will remove the company/contact from the available list and add it to the Project Group.
Optional: Delete Contacts
Scroll down to the Company/Contact in the listing.