Hello,

1) Yes, you can use subreports.
Subreport shows data from different query than the main report.
This query can be related to the main, or it can be completely independent.
I added a link to a video on how to create a subreport.

To show data in a table grid - there is also a table control, it has own query like a subreport.

2) Do you want to pass the value from the text field or selection from the list box?
The parameters can be used.

The parameter can be inserted either to the query or to the expression using $P(paramName) macro.

The report has method to set this parameter:
SetParameterValue( "paramName", "paramValue" )