> For the complete documentation index, see [llms.txt](https://docs.infotopics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.infotopics.com/drilldowntree/getting-started/getting-started-with-drilldowntree/getting-started-with-viz-extension.md).
# Getting started with Viz Extension
1\. **Import DrillDownTree:**
**The first step is to click on "Add Extension" in the Marks pane.**
* If you have a TREX file:
* Click on 'Access Local Viz Extensions'
* Navigate to the TREX file and select the TREX file.
* Alternatively:
* Search for DrillDownTree in the Tableau Exchange.
* Click Add to the dashboard.
**Authorize Extension**: Click ‘OK’ to allow the extension to run in your worksheet.
Start dragging and dropping dimensions and measures into the marks card to get started with DrillDownTree.
---
# Agent Instructions
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