To limits the results to specific content sources or sites in FAST Search for SharePoint 2010 you can create a Scope using PowerShell with FAST Query Language (FQL).
In this example we will creates a scope which include only three content sources.
- Verify that you have Farm Administrator permissions.
- On Microsoft SharePoint Server, open a SharePoint 2010 Management Shell:
- On the Start menu, click All Programs.
- Click Microsoft SharePoint 2010 Products.
- Click SharePoint 2010 Management Shell.
- At the command prompt, type the following command:
New-SPEnterpriseSearchQueryScope -SearchApplication "Test Query SSA" -Name TestName -Description "Test Description" -DisplayInAdminUI 1 -ExtendedSearchFilter 'contentsource:or("ContentSource1", " ContentSource2"," ContentSource3")'
And you can also do the same with site url
'site:or("<ScopeSite1URL>", "<ScopeSite2URL>")'