You can add a Co-Listing agent from the listing worksheet.
(click image above to enlarge)
From the main menu, select Listings.
Find your Listing.
Choose Add Co-Listing Agent.
Select one from your office or MLS.
Choose notification preferences. While you cannot change the Co-listing agents information, you can select how they are notified.
Please Note: These agents can be set up to be notified when showings occur.