Library /sys$common/syshlp/dtm$dw_helplib.hlb overview, filt_use, del_filt  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  To delete a filter from a test description, perform the
  following steps:

  1. Pull down the Maintenance menu.

  2. Choose the Modify menu item and the Test... submenu
     item.

  3. Click on the Options... button.

  4. Disable a filter by clicking on the filter name or
     button.

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