We have tried Data Reduction based on a Field Selection in QV Desktop which works fine with the below Macro code. However while loading the qvw hosted in server with the help of AJAX URL it doesn't reduces the data.
FieldArray = array("CxxxID") // Field name for reduction
Set x1 = ActiveDocument.GetVariable("Input_Value") // To check Permissions
x1.SetContent ActiveDocument.GetProperties.UserPermissions.ReduceData, true // Returns TRUE - We have permission