In service order Search page,In Service Order Search criteria, In Status value drop down i have to show only user status?

Hi Team,

My requirement is In service order Search page,In Service Order Search criteria, In Status value drop down i have to show only user status values only? how to do it..now in my status drop down values system status values also displayed ,i want only user status values only i have to show...how to do it?

Thanks

Kalpana