This feature is available in all editions.
The Release Scheduling feature is an optional release planning tool that allows you to build a project/release plan by scheduling stories/backlog items or portfolio items into projects/releases.
Accessing the Release Scheduling Page
From the main menu, select Release Planning > Release Scheduling.
In organizations where backlog may first be defined at the top of a multi-level project hierarchy, release scheduling allows them to repeatedly push backlog through successive layers to project teams and time frames at the lowest level (where the work will be done). See Working with Release Scheduling to learn more.