You cannot delete a
term that is used in a rule flow or
a decision that has been published.
In the horizontal and
vertical views, right-click on the term in the column or row heading,
and select Delete Term.
Note: In the list view, if you
right-click on a row containing an expression and select Delete,
the expression in that row is deleted from the rule The term remains
in the rule set until you delete all of the expressions that use that
term.