You have created a Web Dynpro DC and a Web Dynpro component.
For more information, see Creating a Web Dynpro DC
For more information, see Creating Components
You have created a usage connection and an implementation connection in Web Dynpro.
For more information, see Using Connections for Extensibility
This procedure describes the general steps for creating extension points in the Composite Designer. The usual scenario is that you create an extension point in your composite application (product) and then you ship it to your customers. Afterwards, the customers create extensions in their composite applications (products).
To create an extension point, you need to have Web Dynpro development components (DCs) in your workspace. These are the development components that contain the interface definitions whose implementation will be exchanged during runtime.
For more information about creating extensions, refer to Creating Extensions
For more information about how to switch the composite usage of one extension to another, refer to Activating and Deactivating Extensions