Hi @mark goldin ,
I did some test locally, it is possible to run a report with subreport without SSRS server.
You may use rdlc report to meet your requirement, here is a tutorial for your referenceļ¼RDLC SubReport for ReportViewer in Visual Studio
Also you could try with this which is a same issue as yours to see if it is helpful.
Best Regards,
Isabella
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