I have a drop down menu that is selecting different positions. Each position variable position is displayed depending on what is selected in the drop down. (variables shown are velocity, accel, ect). If drop down position 1 is selected , the corrisponding variables display below. I am trying to drive what position is displayed inside a data point. {[Covidien]McData.Servo.Axis_01[{[Covidien]vis_Axis_Position_Control1}].Pos} both of these are located within the plc. That setup does not work. ive tried multiple ways: {[Covidien]McData.Servo.Axis_01[{vis_Axis_Position_Control1}].Pos} {[Covidien]McData.Servo.Axis_01[{?}].Pos} {[Covidien]vis_Axis_Position_Control1} ={?} Using an HMI tag in the value then having {[Covidien]McData.Servo.Axis_01[{[Covidien]vis_Axis_Position_Control1}].Pos} = ? I am not sure how i can get this to work. Any suggestions Cheers,