Explanation
Reference
https://docs.oracle.com/en/cloud/saas/project-portfolio-management/19b/oapfm/project-control-configuration-ma Topic - Project Date Cascade Options Use the Cascade option choice list to determine whether your changes to project dates cascade to tasks.
Use the Basic Information region on the Edit Project Template page to select one of the following options:
* Do not cascade project date changes to tasks: Both start and finish dates are editable. However, you must ensure the following:
* The project start date is not later than the earliest task date.
* The project finish date is not earlier than the latest task date.
* Cascade project start date change to affected tasks: You can edit only the project start date.
* Cascade project finish date change to affected tasks: You can edit only the project finish date.
Do not cascade project date changes to tasks is the default value. You must select the cascade option each time you change the project dates, as your selection isn't saved for future date changes.
If you select to roll up planned dates for tasks or are using an external application for scheduling, then you can't modify the project start or finish dates.

Explanation
Reference
https://fusionhelp.oracle.com/helpPortal/topic/TopicId_P_87F467307D50416BE040D30A68816855 Spread curves let you distribute quantity, cost, and revenue amounts automatically across accounting or project accounting periods. You assign a spread curve to each resource class. Planning resources (in the planning resource breakdown structure) inherit the spread curve setting from the associated resource class.
You can change the spread curve for the planning resource and for any corresponding task assignments, or budget or forecast lines.