This is a bit tough to describe with out the specifics of what you are trying to do. One option you can use is to go into the report manager and customize a report to the way you'd like to see it in html and then export it. The other option is to specify the parameters at the command line which is where I'd need a bit more information on what you are trying to do to help give you the right fields. In general any node you specify at the command line will override the setting within the profile. The notation to override the ending row is:
(Shown here running under Windows)
SawmillCL.exe -p profilename -a grf -rn log_detail -ghtd dirname
statistics.reports.log_detail.report_elements.logdetail.ending_row 1000
In the example above, this command will export 1000 rows of the logdetail report as HTML. The "." notation refers to a hierachical field within a profile that you are changing the value for. So if you search your profile for "reports" then "log_detail" then "report_elements" then "logdetail" then "ending_row" you will see the default value in the profile. You can change the value of most any value you'd like however, the command line will get pretty long quickly.
I hope that helps, with more specific info I can provide you a better explanation.
David
Sawmill Product Support Team
support@flowerfire.com