Define your parameter values; if necessary, click
(Refresh Parameter) to see
the list of available parameters. Click down arrow next to Value to
select your parameter value or click [...] (ellipsis) to add a value using the
Formula Editor.
The parameters listed under the Report Parameters tab are defined by a
report author. For example, suppose the report author created a parameter
called "line" (product line). In the Format Element dialog box, the report
author entered Motorcycles as the value for the line parameter.

When the report runs in the Pentaho User Console, users of the report will
link to data associated with Motorcycles. Alternatively, the report author
could have created a link to a specific field on the report. In that
scenario, the data in the field changes dynamically when the report
displayed.
Every piece of content, (reports, dashboards, analyzer reports), in the
solution repository has associated parameters that define how the content is
launched. For example, these System Parameters determine if the
content displays in dashboard mode or if the UI displays the parameter list.
In most instances, you will not have to provide values for these parameters.
See Plugin Parameter Names for more
information.
Custom parameters are parameters that you define manually to create
your link. If you choose to enter custom parameters and their associated
values, click
(Add). Type the
parameter name and its value in the available text fields.