Header For A Multiple Columns

Shreeram04  in your visual you are having i guess sales by month and then you wish to add another value of text type i.e.e area and country is not possible. matrix visual will show first value against all header which is month case and if you add another value that will also be shown against all headers which will not give the correct result. 

in this case, you can either use textbox or reactangle shape to show header for last two columns and seperate header for month values. this is the quick workaround solution that can be used for now.

also, were you able to create the first visual that you have shared above