how to show 3 dimensions on x-axis in barchart ? As shown below

You may not get the X axis look but you may get like Year in X axis and Quarter1,.... Quarter4  as Legends, is this in

Qliksense or QlikView ?

You are limited to 2 Dimensions in a bar chart.  You can add alternative dimensions which might help you out.

You may need to concatenate the year and Qtr together (Q1-2015, etc.). 

Are the 3 bars the months in the quarter or are they the Item types?

I doubt that you will get the exact look you have displayed.  But you can come up with something that will work.