You can execute a single Test Case without creating Test Plan & Test Cycle by following these steps:
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Open a Test Case issue
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From "Add hoc Test Run" section which is located at the right side of the page, click 'Create' button
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Update test result from "Test Case Run" dialog
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Click "Close" link
[Screenshot - UG0028_Test_Case_Quick_Execution]
5. Once the test execution is done, the result will be recorded to this Test Case.