To limit the information displayed in a subreport:
Set
up criteria in the subreport which will filter the information in the
subreport to show only the required records. For example, records for a
particular customer.
Pass
a value from the primary report to the subreport criterion; for example,
the customer reference.
You
can set a static filter in the subreport, but criteria are more useful
when dealing with subreports as you can match the information in the subreport
to the information in the primary report.
Try
to ensure that each report (including subreports) results in a single
database query. If you have a subreport on each row of the primary report,
this will result in one database query for the primary report, plus one
query per row for the subreport; which will be slower than not using subreports.
On
the primary report click the embedded subreport. Small squares appear
as a border around the subreport. Move your cursor over these squares
and drag the borders to the size you want.