You can accomplish that by using cascading dropdown boxes. There are examples on how to accomplish this available in the Splunk dashboard examples app available in splunkbase here: https://splunkbase.splunk.com/app/1603/ Also there are multiple answered questions regarding this topic you can have a look: https://community.splunk.com/t5/Dashboards-Visualizations/How-to-create-multiple-dependent-dropdowns-on-a-dashboard/td-p/391089
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