Using a pre-made template is a quick way to configure commonly used schedules. Click the icon in the top right corner of the Power Schedule Editor to view the template options. 

Network | Thread | Power Scheduler Editor

Select a template to create a custom schedule with a pre-configured schedule row (Wake Duration, Repeat, and Time settings). Once created, you can modify it as desired. 

Network | Thread | Power Scheduler Editor

Click Create at the bottom right to create your new Schedule. If you'd like to modify the schedule again, you can find it in the View Preset drop down bar. If you want to apply it to your Thread, you need to select it in the Edit Configuration section.