How to Pass parameter to formula field

In my crystal report i have to show a column as Total(containing four columns such as SUM({QuestionTarget.QuestionTarget})+SUM({QuestionTarget.QT_FormMen})+SUM({QuestionTarget.QT_ForWomen})+SUM({QuestionTarget.QT_ForGirl})+SUM({QuestionTarget.QT_ForBoy}))

 

Now i want to filter the records based on some district

 

now how i apply filter to formula field in crystal report ????

 

 

any one can help