Hi @-, S Yogesh,
Thank you for reaching out to Microsoft Q&A forum!
Currently, Azure Document Intelligence does not support retraining an existing custom model with new templates. If you need to add new templates, you must retrain the model, which creates a new model. To handle this, you can either retrain the model with all templates, including the new ones, or create a new model and then use a composed model to combine the old and new models. This approach allows you to handle multiple templates without modifying the original model.
For more info, please refer to: Compose custom models.
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