Once you add a headline, you can Cascade it. If you are looking for details on cascading messages - go here.
Add a Headline:
First, use the CREATE button in the top right corner to add a headline.
Headline will be the default option for CREATE when on the meetings page.
Viewing Headlines in Meetings:
Both Headlines and Cascaded Messages will appear in the Headlines section of your meeting. When they are checked (marked done), they will be archived (or attached) to that meeting.
Turn a Headline into a Cascading Message!
Use the more actions button to make it an Issue, To-do or Cascading Message.