You can click on the Timebox page to edit the timelines. Here you can create Sprints for your project. We recommend to create sprints without overlapping dates. The system automatically creates 3 milestones for you. You can add the dates and also create new milestones.
User stories can be created in SAP Cloud ALM:
Sub.tasks can be created from user stories to provide more detail.
You do not need to close the sprints. The sprints automatically show as, "past" when the calendar date is passed.
In the overview tile, you can go to analytics section to view the project progress reports and track the task status and task trends.