Work flow in easy steps

http://learnax.blogspot.in/2012/01/dynamics-ax-2012-workflow-development.html
http://www.amer-ax.com/2010/07/create-workflow-in-three-easy-steps-by-workflow-for-dummies/

Dynamics AX 2012 Data Import using Excel Add-in

http://ax2012exceldataimport.blogspot.in/2012/01/dynamics-ax-2012-data-import-using_17.html.