In addition to using the Enterprise Services delivered by SAP, the Enterprise Services Repository provides end-to-end support to model your own services. You can reuse the pre-delivered content that SAP provides to model and define your own SOA artifacts.
Define the high-level Process Component Architecture Models.
More information: Working with Process Component Architecture Models
Model the artifacts in the Enterprise Services Repository.
More information: Working with Service Definitions
Generate proxies and implement the service.
More information: Generating Proxies
Publish the services in the Services Registry.
More information: Publishing Service Interfaces