Drilldown Issue in Powerplay script.

[srk]

I have a Cognos script that runs a Powerplay report, saves it as a PDF and emails it to users. Prior to saving as a PDF I need to drilldown on a nested column.  The high level column is "Rolling 12 Month"  under this is 5 measures.  I need to drilldown on "Rolling 12 Months" before saving as pdf.
I am having problem setting the column and doing the drill down.  Can anyone provice the macro commands to do this?