Generating third graph on serial chart

[MuhammadYasir]

Hi there,

I have generated serial chart on dashboard while looks like as below:

I used grouped value option to generate the grpah. X-axis shows the month and I also used split-by-field to generate two types of bar. 

Now I want to add third type of graph (i.e. line) in the same chart, which would look like this:

 

I couldnt find any option to add third graph. I tried to generate the graphs using features option on serial chart. But the problem with that approach was it didnt group the month column (category field value) and it shows all value of months on x-axis. Could anyone help me to sort out the issue?

[MuhammadYasir]

Any suggestion!!! comment. Waiting for the reply