Hi @Ysa8989 ,
There is no common method to access data in a subreport. The SSRS model is that parent report data is processed, subreport data is processed, the subreports are rendered, results go back to the parent, then parent is rendered, including the subreport as appropriate. The only data passed between the two is parameters are passed into the the subreport, and rendered output is passed back to the parent.
For more information,please refer to :https://stackoverflow.com/questions/19279412/ssrs-pull-variables-or-values-from-sub-report-into-main-report
Best Regards,
Isabella
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