If you want to search on top of another search, try saving your search as a view. Then, you can use the saved view as a data source for a new search.
This procedure walks you through creating a view from a search. To create a view from a search:
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Start a new search, or edit an existing Answer, or visualization from a Pinboard.
Any filters or aggregations created during this search become part of the new view.
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Make any changes to the visualization that you want in your saved view (change aggregation level, filters, etc.)
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Click the More menu (ellipses icon), and select Create view.
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Give the view a name and save it.
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Link your view to any other data source, or define joins.
Your view is now saved. You may want to materialize the view to improve its performance when searching.