You can combine more than one chart type to create layered charts, such as overlaying a column chart with a line chart or spline chart.
To create two chart layers
| 1. | In Visualizer,
add one or more measures and attributes to plot a chart. For example,
Revenue by Year/Quarter as a column chart.  |
| 2. | Add a measure
and specify a different type of chart. For example, drag the Quantity
measure and drop it on the Line suggestion.  |
Visualizer creates the line layer for Quantity.
The Revenue tab has a column icon to indicate it is a column chart and
the Quantity tab has a line icon to indicate it is a line chart.
Tips:
To change the line chart to a spline chart, click the tab with the Line icon then select spline from the list of chart types.
If
your chart has more than one axis, you can click Merge Axes 
to combine the axes into
one. If the scales are too different (as in this case) merging the axes
may not produce desirable results. To spit a merged axis, click Split
Axes 
.
| 3. | Click Save
 . |