1. Open your event's dashboard and click on "Event app".
2. Click on "Settings".
3. Click on "Manage rules" under the "Chat" tab.
4. Click on "Add rule".
5. Click on "Choose groups".
6. Select your desired group.
7. Click on "Choose a group".
8. Select your desired group.
9. Click on "Save rules". Now only people present in the "Ceo" group will be able to chat with "investors".
10. Click on "Save settings".
