CodeSmith Generator offers several ways to share common code between templates:

You can place utility functions in a custom template class and reference it in the Inherits attribute of the CodeTemplate directive.
You can base templates on a common template class by using code-behind files.
You can compile common functions into an assembly, and reference the assembly using an Assembly directive.
You can place common functions into a source code file, and reference the file using an Assembly directive.
You can use sub-templates to share code between templates.
You can place common code in a separate source file and use an include statement to pull it directly into your template.

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