I am Having a Temporary Page call TempPage.over there i am storing case ID in the clipboard .need to map that clipboard value in to a data page as a parameter using data transform.
Assuming that your datapage name is D_ABC and the parameter you have defined in the data page is named CaseId, you can always refer the data page as below
D_ABC[CaseId:TempPage.CaseId].
in your data transform to pass the parameter into your data page