If you want to create a column chart and have a line across the top showing the numbers in two different ways, it is easy to do in SSRS 2008. Just drag over the data into the data field twice. Right click on the data field on change the chart type to line and the other to column.
Here is a table I used to show this.
I created a Column chart and dragged over the date and numbers fields as shown.
Notice I placed the Number data in the data field twice. Then I right clicked on the data field and select the change chart type option. Then selected line chart.
After I select line chart and click OK the chart looks like the image below. It now has columns and lines on the same chart.
If you have multiple Series and only want to show for one series in the chart you will need alter the visibility. Here is the chart with a new columns I will use for the series.
Refresh the data set and drag over the rep to the series field.
Right Click on the data field and go to series properties...
Then set the visibility expression. Remember to set it to Not equal to, this is setting who to hide, not who to show.
The Chart will show multiple columns and a single line.