How do I add sorting capability by Month, Year and Sales columns?

Hi

I am new to HANA XS/Eclipse IDE Dev and need your help or guidance.

I have a SAPUI5 Screen and existing code - xsjs, Odata that I need to modify.

I need to be able to click on Column1, Column2 and see options for Sort on Ascending order or Descending Order for each column. Using this I need to be able to Sort by col1,col2 in that order of priority. How do I do this?

I really appreciate any suggestions or help on this!