You can create groups to have a pre-selected set of people to send a message quickly. The groups will be available under the My Groups when you or other users are selecting recipients for messages.
Great for sports — Coaches, create a group for your team and their parents for when you need send them messages.
Use for clubs — Send out meeting reminders or special interest newsletters.
Want to contact only the parents of a specific class? — Select only the parents of one of your classes.
Select Messages > Groups.