When you create a new project template or project, the project structures are not enabled. You can enable a workplan structure and a financial structure for your project on the Structures setup page.
If you enable both a workplan structure and a financial structure for your project, then you can choose whether to integrate the two structures and the degree to which the structures are integrated. For more information, see: Integrating Workplan and Financial Structures.
Other Sources
Defining Project Templates, Oracle Projects Implementation Guide
Enabling Workplan Structure and Workplan Versioning, Oracle Projects Implementation Guide