Options for customizing rule authoring
You can customize business rule authoring at different levels. For example, you can add custom types for BOM values, define your own business rule language, customize the Intellirule editor, and translate your business rules.
The words in a business rule are a mixture of vocabulary elements and business rule language constructs.
Vocabulary elements come from user-defined BOM entries and the System BOM provided by default in a rule project. The System BOM also has a vocabulary layer that you can see in the System entry of the Rule Designer Vocabulary view.

Add custom types for values in the BOM and handle the way they are displayed, edited, and processed in rule editors. See Extending BOM value types.
Use scripts to customize the Intellirule editor. See Properties of the tree view of the completion menu.
In all cases, after customizing business rule authoring, you must integrate your extensions into Rule Designer and Decision Center.