When you import a workflow from PowerCenter, the Start and Session task, which includes both reusable and non-reusable task, imports into the Model repository. In the Model repository, each workflow contains an End event after you import from PowerCenter.
The Developer tool does not include options to import from and export to PowerCenter.
Branches in the PowerCenter workflows gets routed through Inclusive gateways in the imported workflows in the Model repository. An Inclusive gateway requires at least one of its outgoing sequence flows to be set as default. The first outgoing sequence flow from the gateway becomes the default and the imported workflow remains valid.