Column Feature in Reporting

Column Feature in Reporting

I am trying to run a monthly report from service desk. I want the top colume to be weeks (say,week 1,week 2...) for a particular month and the left to be request category.However, from the drop down list of options,it only contains created time,responded time, etc..... and does not contain weeks as I want in my reporting format.
 
What could I do to include weeks on the top column.
 
Thanks
 
LSmith
 
Papua New Guinea

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