Customized Row in a table

[#1]

Dear Qlik Guys

Could you guys help me, in creating a custom table. In here I have selected cluster as ABC and SubCategory as ABC and I need to have a custom row defined for every such selection set with the difference.

Year	Cluster	Sub Cateogory	Data
2012	ABC	ABC	8900
2013	ABC	ABC	8200
Difference	ABC/ Null	ABC/ Null	700