Adding reference lines in variability plot

NewToThis

I have two tables

Table1 is dt=Data Table("Data"); It has columns :WAFER, :STRUCTURE, :PARAMETER and :Value 

Table2 is dtr= Data Table("Targets"); it has columns :PARAMETER, USL, LSL & Target

In one window ( that is active and can be used for point selection or changing legends) I want to have variability charts of all the parameters along with reference lines added (Target, USL, LSL) for each PARAMETER 

if a parameter does not have a target, in the Targets file (dtr) but has data in the DATA file (dt) , the variability plot is created without the reference lines. Otherwise reference lines are added

nw << Append(
	vc = dt << Variability Chart(
		Y(:Normalize Value),
		X(:STRUCTURE, :WAFER),
		Variability Analysis(
			:Value,
			Connect Cell Means(1),
			Std Dev Chart(0),
			Points Jittered(1),
			AIAG Labels(0),
			Show Box Plots(1)
		),
		Where(:Parameter == currentParam),
		SendToReport(
			Dispatch({"Variability Chart for Normalize Value"}, "2", ScaleBox,
				{Add Ref Line(lsl, "Dotted", "Red", "LSL", 2),
				Add Ref Line(target, "Solid", "Black", "Target", 2),
				Add Ref Line(usl, "Dotted", "Red", "USL", 2)}
			)
		)
	)
);

Edit (jthi): added jsl formatting

jthi

Use For Each Row to loop over your targets table (assuming all parameters are there) and create plots in the loop. You can have separate variability chart messages for different cases (limits/no limits). For the limits one, use expression evaluation to add the limits.