Task groups are savable collections of tasks that can be added to jobs. The user interface works much like the task interface for jobs.
Creating Task Groups
From the Groups section in the navigation menu select Task Groups. From here give the task group a name. Then you can add tasks and arrange their run order as needed.
Using Task Groups
In the job's Tasks tab, you can opt to add a tasks group in addition to the tasks on the job. The groups task's will be read-only in this case. The task group can be run before or after the specified job tasks.