As far as I understand your template case, you need something similar to our Structured Content Editing demo which you can find here with its code. There you have static content and recipe specific information.
You can use custom fields for placeholders in a document which you can create or extend using the editor UI and and a simple button to insert those fields extending AnnotationRangeStart and AnnotationRangeEnd at the required positions to mark the dynamic fields. You can read more about annotations in this article.
After creating the template document you can save it as XAML and then programmatically load it in your project and manipulate the fields with the document API.
If you are having difficulties achieving those tasks please get in touch with us and we will be happy to assist you further in this case.
All the best,
the Telerik team
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