To apply a filter to result files when you create or
  modify a test description, perform the following steps:

  1. Pull down the Maintenance menu.

  2. Choose the Create or Modify menu item (depending on
     whether this a new or existing test) and choose the
     Test... submenu item from either resulting submenu.

  3. Click on the Options... button.

  4. Enable the filters you want applied to the test.

  To apply filters to any file, including files not
  associated with DTM, perform the following steps:

  1. Pull down the Testing menu.

  2. Choose the Filter... menu item.

  You must re-create any test collections that include
  modified tests.