About user-defined functions
An experienced programmer can create a user-defined function using a programming language such as C# and make the function available to Central Designer users for use in rules. In rule processing, a user-defined function is treated as a local method on the study object class.
Assemblies that contain user-defined functions that are used in a study are included in the deployment package.
To associate user-defined functions with libraries or studies, you must import the functions in the Functions tab of a study or library. For more information, see Importing a user-defined function.