BEx report with CalMonth in column and qty in row for prior months

Hello,

I have a requirement to create a BEx query where i need to achieve below results

Columns = Months, rows = Qty

Desired layout

                                                                                  (columns)      July'13                Aug'13                Sep'13

(rows)

Qty(on 1st business day of month)                                                 July'13 data        Aug'13 data        Sep'13 data                               

Qty(on 1st business day of month for 3 mnths prior)                      May'13 data       Jun'13 data         Jul'13 data

Any suggestions would be highly appreciated.

Thanks,

MNK