You can use Process Developer to design a process using top-down, bottom-up, or a combination of techniques.
In the top-down technique, you sketch out your process by dropping down activities onto a canvas and creating links between them. You then add the information that binds the activities to an implementation and add decision-making to make your sketch a working process.
In the bottom-up technique, you use the definitions of the implementation that are available when you begin creating a process. The bottom-up technique requires complete and valid Web Services Description Language (WSDL) files. See
Using WSDL References for Efficient Design
In the combination technique, you can start a process with WSDL files already imported into your project. If you need additional WSDL files, you add them using the Interface Wizard. See