How to calculate month-on-month comparison?

[#1]

As we can see from the picture above,there are two columns and two lines in the chart.

I have already add two columns and the expressions are used as follows:

ADamount: sum({$<cal_month={"2014*"}>}[AD_amount])/1000

Receiveamount: sum({$<cal_month={"2014*"}>}[receiveamount])/1000

But how to add two lines as month-on-month comparison?

[#2]

I'd like to share the chart,but  it's one part of my report. I don't know how to spilt the chart from the whole report.