Add dynamic sub report

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SSRS

reporting-services

Hi pro !!!
I have a context. I have a main report. In form, i have a dropdownlist to list sub report's name.
When i check sub reports and press View, it will add number of sub report to main report.
How can i do ???
I have a way : i add sub-report to report and visible when check checkbox.
But i dont want to visible . I want to add dynamic subreport.