To include a grouping control with a result list, you must do the following:
1. Establish the desired metadata columns as managed properties in SharePoint (see “Establishing Custom Properties in SharePoint”).
2. Configure the relevant managed properties as grouping properties for Search & Preview (see “The Grouping Properties Page”).
3. For each relevant result page, place an Search & Preview Search Summary Web Part that is configured with grouping enabled and with an XSLT template designed to implement a grouping control. See “Search & Preview Search Summary Web Part” for details about how to make these settings.
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