Usenet Explorer User's Manual/User Interface/Filter Editor
To show the Filter editor, select Edit > Filter editor, or click the Filter editor icon in the Filter task bar.
The main list contains all defined filters. The details of the selected filter are shown below the main list.
To create an empty filter, click on of the Insert arrow buttons. To copy a filter, select a filter, click Copy and then click one of the Paste buttons.
To visually separate groups of related filters, create new filters below and above the group, and select the Predicate "Separator".