Planned test case
A Planned test case is a copy of a global test case which is assigned to the template of a test plan.
By creating a planned test case from the global test case, you specify that the test case has to be tested for the assigned test plan.
Creating a copy of the original test case (as opposed to just a linked reference to it), you ensure that future changes to the global test case do not modify the test plan with the planned test case. This avoids erroneous falsifications of tests that have already been performed.