Step 1
Right-click a continuous axis and select
Add Reference Line.
You can edit the reference line later by right-clicking the axis and selecting Edit Reference Line.
Step 2
In the Add Reference Line dialog box, under Scope, select an option to show a line across the entire table, just within the pane, or for each individual cell.
Step 3
Select the
Value you want to reference. You can select a computation such as Average, Minimum, or Maximum, or you can select Constant to type a specific value. Computed values can be based on any measure used in the view.

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Step 4
You can use the Formatting section of the dialog box to select a color and style options for the reference line. You can also use the Fill options to shade the background.
