Creating Test Cycle
Launch a test plan issue, from “Test Plan Details” panel, click “Add” button, then specify below information to create a test cycle.
Name (required)
Environment (optional)
Build (optional)
Sprint (optional)
Start Date (optional)
End Date (optional)

The newly created test cycle will be listed in “Test Cycle” tab.

Once a new test cycle is created, it is good for next step: Selecting Test Cases