HI,
I've subreport item in Main report.
I will be invoking the subreportin general property ( by selecting subreport in drop down list)
parameter mentioned as -> =Join(Parameters!GroupLEVEL3DATADistrict_ID.Value, ",") in sub report property parameter section & to pass value subreport.
Subreport
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Dataset parameter ->=Split(join(Parameters!GroupLEVEL3DATADistrict_ID.Value,","),",")
Thanks