No.
Document Intelligence doesn't have an explicit retrain operation. Each train operation generates a new model.
If you find that your model needs to retrain, you can add more samples to your training dataset and train a new model.
You can also create a new model to compose with your original model as follows:
Create a dataset for your new template.
Label and train a new model.
Validate that the new model performs well for your specific document types.
Compose your new model with the existing model into a single endpoint. Document Intelligence can then determine the best model for each document to be analyzed.
For more information, see composed models.