If you have not already done so, insert an Event chart by selecting it from the Insert menu, or double-click an existing chart to access the chart's configuration panel.
Click the Events tab.
Click the Add a new Event button 
. The Add Event prompt
appears.
Enter a name for the new Event and click OK.
To narrow the time span that data will be retrieved for, on the HintTime tab, select the time mode option and set the times as required:
For the Absolute option – select the specific Start and End times.
For the Relative option – select options from the Start and End list boxes. The Start and End date/time display automatically updates as you change the values.
For the Range option – select an option from the Range list box. The Start and End date/time display automatically updates as you change the value.
If required, pick a Time Zone. The Display Time Criteria Time Zone is the default setting (the time zone defined for the current display).
Click the Query Tags tab and set up to three queries as follows:
Click the Query Tag1 ellipsis button. The Data Source Browser appears. Select the tag you want use for the query.
In the Caption box, enter a label. This label will appear at the top of the Event chart above the Value fields (used to change the time criteria for pens).
Select a value for the query from the Value list box.
If you want to filter out some of the values:
Select the filter criteria from the Criteria list box.
In the Expression box, enter a string value that the filter criteria will use for its calculation.
From the Batch Marked list box, select At Start if you want the batch to be labeled prior to starting, or At End if you want the batch to be labeled after completion.
Click the Update button to update entries displayed in the Value field to match the specified criteria.
