Work planning
After the project schedule is created, you can fill the "packages" (iterations, phases, and so on) with specific work.
Tasks link a due date for the work to an assignee. When you create a task, on the Dates tab you can include the task in the work "package" of the selected iteration:
Another way to plan tasks is the "Operational plan" module. In this module, tasks from the "Backlog" (the list of unassigned tasks) are distributed across Iterations (work "packages").
When the work plan is based on a document, for example a Technical specification, tasks are created directly from the document:
On the Dates tab of the new task, specify the iteration in which the work on that section of the specification is planned to be finished.