Below are the functions that let you work with multiple version of a model.

Use the list_versions() method to view all available version of a model:

model_name.list_versions()

Use the get_version() method to use a specific version of a model:

model_name.get_version(9)

Use the set_active() method to set a specific version of a model as active:

model_name.set_active(9)

Use the drop_model_version() method to remove a specific version of a model:

project.drop_model_version('my_model', 3)

Please note that the model version should be deactivated before it is removed.