Hello Thibault,

For reusing already built model there are multiple options:

• Register the model from dev to QA model registry as described here OR
  • In this scenario only the registered model will be copied
  • Lineage to runs is not possible
• You can copy dev's registered model and the MLflow runs that are linked to its versions to QA workspace (details here and here)
  • This approach will keep the lineage
  • This approach has some limitations (listed here)

If the ask is changing the stage of the registered model version in the current registry:

You can only have one stage per version. However, you can register the same run's MLflow model with more than one registered model (version). which is available using API (example here)

I am happy to help with any further information needed.

Regards