This wizard is used to create Meta Entities, Meta Entities Type, or Meta Data Aggregates according to the type of entity chosen in the menu of the Design Explorer. Some of the fields in this wizard are specific to the type of entity created.
If you are maintaining a Pacbase application, selecting a package is not advised. The instance override mechanism is then made easier because the overriding instance is always in the same package as the overridden instance. You do not need to manage the presence of both the instances in the same package, which is the requirement of an override.
A project represents the physical distribution of your instances in your workspace. It groups directories and files. It is used to organize resources which can be built, shared, or stored as a version.
A Pacbase project contains a subset of files, which correspond to the models and the generated sources that make up an application.
There can be various projects for each location (a location is the equivalent of a database).
When a Meta Entity Type is created, a new tab is added in the editors of the entities that is associated with the Meta Entity. For example, if you select Program as entity Type in the Type field when you create a Meta Entity Type, a new tab is displayed in the editors of all Program instances and the tab is named with the label of the Meta Entity Type.