A subreport is a report item that displays another report inside the body of a main report. Conceptually, a subreport in a report is similar to a frame in a Web page. Even through it is embedded into main report, it's a separate report, we can pass values
from main report to subreport using parameters, however we cannot use the main report dataset in subreport directly. For the detail information about it, please: Subreports (Report Builder and SSRS) Add a Subreport and Parameters (Report Builder and SSRS)
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