You can delete any custom model you create. When you delete a model, Metadata Manager removes any classes, properties, and associations for the model.
You cannot delete a model if you added metadata based on the model. If you loaded metadata using the model, or if you added metadata to the metadata catalog based on the model, purge the metadata from the Metadata Manager warehouse or delete the resource in the metadata catalog before you delete the model.
To delete a model:
Select the model that you want to delete in the Model navigator.
Click Actions > Delete.
Click OK.
Metadata Manager deletes the model and all classes for the model from the Model navigator and the Metadata Manager repository.