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.

Test cycle can be reordered by drag and drop operation.
Once a new test cycle is created, it is good for next step: Selecting Test Cases