Creating a FAST Search Scope

When you try to create scope in Fast Search Search 2010. This will not work only way to create scope in SharePoint Search using PowerShell. Command Below is sample of command for creating scope:

New-SPEnterpriseSearchQueryScope -SearchApplication "FAST Query Application" -Name "NewScope" -Description "This is my new scope" -DisplayInAdminUI 1 -ExtendedSearchFilter 'path:starts-with("http://myserver/mysitecoll")'

The ExtendedSearchFilter parameter specifies a FAST Query Language (FQL) expression that will filter the content for that scope.

There is 2 good blogs talk about Fast Search scope:
http://blogs.msdn.com/b/jorgeni/archive/2010/02/26/search-scopes-in-fast-search-for-sharepoint-part-1.aspx

http://blogs.msdn.com/b/jorgeni/archive/2010/03/11/search-scopes-in-fast-search-for-sharepoint-part-2.aspx