Searching by FullPath column on a portal - customizing standard search

Hi,

I need to extend the standard web search on a portal to include a "FullPath" column of "Org" and "Department" tables. For now searching is working only by "Ident_Org" and "DepartmentName".

I've already discovered the code of search, but, unfortunately still unable to find where I can define one or another column of a table which should be included in search term.

Regards,

Pavel