how to edit configuration item search form

Hello dears , 

i'd like to edit the search from of the confirgation Items to add a "company "filed  from device table ? so to be able to search which Ci belong to which company 

my problem is i do not know how to know the from name to edit , in the left down side of the screen it shows the from name is FilterAdvFind(am.search) . here i am confused both of "FilterAdvFind" and "am.search" froms are not the shown on the screen (screenshoot)

could any one tell me which from i can edit .

thanks in advacne 

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