In BIRT, when editing line charts, how do you plot multiple series of the same data?

I work with the BIRT plugin for Eclipse and have a data set for a printing system consisting of the following entries:

Date date NumberOfJobs int8 UserName text

I want to plot the NumberOfJobs in a given time period for each UserName (so 开发者_开发问答if I have 5 distinct user names, I should have 5 series in the chart). I know how to plot the NumberOfJobs for all users, but not for each one separately. Is it possible to do that? If yes, how?

In the chart wizard, on the Data Tab, there is a "group by" selector on the right-hand side. Drag your Username field from the data summary at the bottom over to the grouping control.

Select Chart TYpe -> Multiple Y Axis = Secondar