Start with the following dataset:
Drill-down/Up via Grid option allows you to drill-down or up the dimension by clicking on the 6 (down arrow) and 5 (up arrow) icons beside the dimension member (i.e. Q1, Q2, Q3, Q4). Only the member that was selected will be drilled (Drill Level drills down/up the whole dimension). In the following example is shown drill-down on Q1, time dimension:
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