A new rule may be defined at any level in the tree. Just right-click on the level below which you wish to create the new rule (or on the name of the component, for example "Helix QAC for C" or "Helix QAC for C++", if you wish to create a new top level rule). Then select New Rule in to display the Rule Editor, complete the fields, and click Save.
The New Rule feature is useful for defining customized rule groups in a hierarchy.