In Enterprise Architect a model is a special type of Package, being the top level entry point to a project file. You can develop a project with one model, or with several. Each model is a root node of a hierarchy of Model Packages and Views and, below them, Packages that contain the diagrams, elements, relationships and associated metadata that define the structure and function of a system or process. These components are organized through the Package hierarchy, which helps to group and manage related components; by iterating through all models, you can access all the elements within the project.
You can create the model or models when you first create the project, or you can add and develop new models later. When you first create a project, Enterprise Architect automatically displays the Model Wizard, which you use to generate the required models and subordinate structures from a wide selection of Model Patterns. However, you can also create a model as a single project root node with no content, and build up the model structure yourself, using the menu option:
Project Browser context menu | Add | Add Model (root node)
You can also delete a model, but be aware that everything contained in the model is deleted as well.
Right-click | Delete Project Root