@MeeraAgrawal If you have an extension you would like to import, you can do so by going to the Hub > Profile > Administration > Extensions. The extension must first be added to the library and then it will appear under the Extensions section in your screenshot.
You also have the Dashboard and Visualization extensions preloaded, so if you click on those headers, you should see the available extensions.
Once you have the extension uploaded or opt to use one of the bundle extensions,just like any other chart, you can drag and drop the object onto the sheet.
Here is more information on managing extensions, the Dashboard bundle, the Visualization bundle, and adding custom objects.
If you have a more specific question, please let us know so we can assist further.
Help users find answers! Don't forget to mark a correct resolution 🙂
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