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A composed model can be created by taking a collection of custom models only and assigning them to a single model built from your form types.
But there is an option to select the Prebuilt models into a Custom model. To select the Prebuilt models into Custom Models, upload the documents and select Run layout, click on the Auto-label of Current document and select the prebuilt models such as invoice model, receipt model, etc., as shown below:
For more information on Composed models see: Compose custom models & Document Intelligence composed custom models.
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