You can create condition elements in filters by dragging and dropping alert information from the event list into the Filter Builder. The condition element is created using the value of the column from where the drag-and-drop action was started.
For example, if you click the middle mouse button over the event list in the Severity column on an event that has a Critical value, and then drop this into the Filter Builder, a condition element is created and set to Severity=Critical(5).
Repeat this process to create more condition elements that are joined to the existing tree with logical elements.