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Mermaid Drill-Up and Drill-Down Flowchart.
![Mermaid Drill-Up and Drill-Down Flowchart.](/sites/default/files/styles/16_9/public/screenshot/mermaid_drill-up_and_drill-down_flowchart._97053fd0-41ae-4a27-83c5-99ac3e13b3b5.png?itok=otnZLwQw)
With this Template you can drill up and down by clicking nodes on the chart. This will allow you to see the structure of a hierarchy 3 levels at a time. It can be applied to any structure with a parent-child relationship. My initial application uses database queries to populate the structure.