To handle a custom spread on budgets and forecasts, you can either create a new spread curve or edit an existing one to match the desired spread points. Then, you can attach the spread curve to a project template or a resource class, depending on whether you want to apply it to all projects using that template or all transactions using that resource class. https://docs.oracle.com/en/cloud/saas/project-portfolio-management/20c/oapfm/define-project-budgets-and-forecasts.html#OAPFM2355819

The project requirements work area is a work area that allows you to define and manage requirements for your projects using various methods and sources. Requirements are statements of needs or expectations that must be met by the project outcome. Backlog items are a type of requirement that are used for agile projects that follow an iterative and incremental approach. Three of the tasks that can be performed using the project requirements work area are:
creating projects and tasks in the context of backlog items: This task allows you to create new projects and tasks or link existing projects and tasks to backlog items. This helps you to plan and execute the work that is required to fulfill the backlog items.
creating issues for the backlog items: This task allows you to create new issues or link existing issues to backlog items. Issues are problems or risks that affect the progress or outcome of a project or requirement. This helps you to track and resolve the issues that are related to the backlog items.
tracking backlog item status from the requirement storyboard: This task allows you to view and update the status of backlog items from the requirement storyboard. The requirement storyboard is a graphical representation of the progress and completion of backlog items using various stages and lanes. This helps you to monitor and control the delivery of backlog items. Adding scrum master to backlog items and creating change orders for the backlog items are not tasks that can be performed using the project requirements work area. Adding scrum master to backlog items is a task that can be performed using the project team work area, as scrum master is a role that is assigned to a project team member who facilitates and coordinates the agile project activities. Creating change orders for the backlog items is a task that can be performed using the project change management work area, as change orders are documents that capture and approve changes to a project scope, schedule, or budget. https://docs.oracle.com/en/cloud/saas/project-portfolio-management/20c/oapfm/manage-project-execution.html#OAPFM2356321

Ref: https://docs.oracle.com/en/cloud/saas/project-portfolio-management/19a/fapfm/implementing-project-execution-management-applications.html#FAPFM1724547 Topic - Submitting the Process to Maintain Project Resource Search Index: Procedure Submit the Maintain Project Resource Search Index job set to update the resources that appear on the Search and Evaluate Resources page when a resource manager searches for resources to fulfill project resource requests. The job set consists of a set of processes that facilitate efficient and rapid searches for qualified resources.
Resource managers can,t search for resources or view resource details if the search index isn,t available for a project resource request with qualifications or keywords. For project resource requests without qualifications and keywords, resource managers can search for and evaluate resources based on resource availability even if the search index isn,t current or available.
Caution: The search index isn,t available if the Maintain Project Resource Search Index job set process fails, or while the process is running.

Shift is one of the key elements in defining project and resource calendars. Two additional key elements that are required to define the project and resource calendars are:
Schedule Exceptions: These are dates or periods that override the regular workday patterns and shifts of a calendar. They can be used to define holidays, vacations, or other special events that affect the availability of resources or projects.
Workday Patterns: These are patterns of working and nonworking days that repeat over a period of time. They can be used to define the standard working days and hours for a calendar. Time off, expenditure type, and accounting calendar are not key elements in defining project and resource calendars. Time off is an attribute of a resource assignment that reduces the availability of a resource. Expenditure type is a classification of costs that determines how they are processed and accounted. Accounting calendar is a calendar that defines the accounting periods and dates for transactions. https://docs.oracle.com/en/cloud/saas/project-portfolio-management/20c/oapfm/manage-project-resources.html#OAPFM2356131