Plotting Curves from Different Tables

Hi, 

I request your assistance on the following queries. These maybe basic queries, but I am quite new to Power BI. 

1) I want to plot the curve from Plot I and Plot IA on the Main Plot iteself. In this way, there will be five curves on the Main Plot. 

2) In the same plot, there is a slicer to filter the data range. However, I need a button. When we press that button, the data and average of only current month will display.  The button name could be Current/Active button. I know how to create a button. But I don't how to wirte logic for the current month in DAX. 

3) Is it possible to show differnt units on the main plot. To illustrate, when I click the Curve A, ft is displayed. And when I click the Curve C, Newton is displayed along the y-axis. 

Many thanks in advance.