If you mean that you want to display the [Net] measure as a line chart, you can do it like in the attached (sheet 2)
(I had to FLOAT() [Net] in order to be able to sync the axis)
If you want a ref.line by pane, you can edit the reference line and select Per Pane in the Scope, but this will give you a single value line representing the aggregation of [NET] for the whole pane. (sheet 3).
Ref Line Example ed mc.twbx 2.1 MB