How to display column chart in group of y-axis format on pdf using itextsharp

Question

Hi,
Im doing code in C# and  want to display my column chart(Using System.Web.UI.DataVisualization.Charting) in below format , means want to display Y -axis elements in grouping.
I used itextsharp for creating pdf and in that pdf i have created column chart.
so plz help me.