Login, go to "Other" then "System Administration" From "System Administration" select "User Restrict".
After you select "User Restrict" Click "Add New User Restriction'"
Select the user you want to hide certain charts from, the clients you want to hide and click "Create"
After clicking "Create" you will see your new "User Restriction" in the repository of active restrictions.
Now the the "User Restriction" is active the charts will be hidden from the user.
All other users will still be able to see the clients in the waiting room.