To Define a Filter "on-the-fly" Using the Level Manager Dialog

In the Level Manager dialog, click the List Filter icon.
A list of filters displays.
Click Untitled.
A blank filter line appears at the top of the filter list.

Level Manager with blank filter line showing
Click any category and fill in the desired values to create the filter criteria.
Press <Enter> on each category to accept the entered value.
The filter is defined. You can toggle on/off this filter by clicking the List Filter icon. The filter remains until you exit.
(Optional) Do one of the following:

To name and save the filter, from the Filter menu in the Level Manager dialog, choose Save As.

or
Right-click the Level list and choose Save Filter.

The Filter Save As dialog opens.
(Optional) Enter the name of the filter to be saved in the New field.
(Optional) Click OK.
The filter is saved.