Since the report is exported out as a pdf file, the report can not
be refreshed unless you re-export the report.
You may want to look at using the Crystal Report Viewer control
in VB to allow you to view/export the report in real time.
Although if you are distributing the program ther may be licensing issues.


As far as the previous post, you need to create a parameter at
the main report level. Then link the parameter to the subreport
by reimporting the sub report. This will allow you to pass a
parameter to the report which will inturn go to the sub report.


HTH