Delete a Custom model
You delete a custom model just as you would a glossary by navigating to the custom model in Manage > Configuration or Manage > Repository and using th context menu to Delete the model.
Steps
Sign in as a user with at least the Metadata Management capability object role assignment on the Configuration you are in.
Go to MANAGE > Configuration in the banner.
Navigate to the custom model.
RIght-Click and select x Delete
Click OK.
Information note
You may do the same from Manage > Repostiory.