This plugin is not for general use. It needs development for each client. The plugin provide a qualified search argument.
This plugin provides a widget that looks very similar to the standard ‘search’ widget.
A further condition of any search can be added to the Category in wp-admin. The name of the category should be added; it is not case sensitive, but what is entered here will be displayed on the page above the Search Box.
The user can enter a search argument in the usual way.
A visitor to the Admin -> Appearance -> Widgets page, will be able to select the “Search Qualified” widget and place it in any desired Sidebar. The required Category should be entered at this point.
The user can then enter a search argument, which will be qualified by the entered Category.