How to pass a parameter from the main report query to a subreport query in BI publisher.

Hi All,

I am trying to build an invoice template on rtf format that we have on the cyrstal. It has many subreport on it like line note and header note. I am facing some challenges while importing the subreport in the main template. Both the template has the ps query as the data source. We need some help on how we can import the subreport to the main report and how the parameter can be passed to the main report. I refer to the Oracle delivered template where such kind of subreport are being used but unable to figure out how