- Create a parameter field in the main report.
- From the main report, right click on the subreport, and select Change Subreport Links.
- In the subreport linking window, select the parameter field from the window labeled "Available Fields", and click on the ">" button to move it to the window on the right labeled "Fields to link to"
- Below, make sure you have a check next to Select data in subreport based on field.
- Below the checkbox, if it is not already there, select the field from the subreport, to which you would like the parameter field linked.
- Click OK
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