Reference https://docs.oracle.com/en/cloud/saas/project-portfolio-management/19b/oapfm/define-project-organizations.html#OAPFM177674 Settings That Affect Performance Data Summarization You can summarize performance data for a project unit, business unit, a range of projects, or projects managed by a project manager. When you run the Update Project Performance Data process from the Scheduled Processes page, select one of the summarization methods from the following table:
Summarization Method
Usage
Incremental
Summarizes new transactions that are yet to be summarized
Delete and re-summarize
Correct summary data when the source system data changes outside the regular transaction flow.
Do not use this summarization method when you run the Update Project Performance Data Without Producing Report process unless you are advised to do so.
Resource breakdown structure
Migrate all summary data from one resource breakdown structure version to the next.
If you select this option, you must also specify the resource breakdown structure header.

Ref: https://docs.oracle.com/en/cloud/saas/project-portfolio-management/19b/oapjf/define-project.html#OAPJF220111 Asset Cost Allocation Methods The asset cost allocation method determines how indirect or common costs incurred on a project are allocated to multiple assets.
You can specify an asset cost allocation method to enable Oracle Fusion Project Costing to automatically allocate unassigned asset lines and common costs across multiple assets. Unassigned asset lines typically occur when more than one asset is assigned to an asset grouping level.
Projects and project templates inherit a default asset cost allocation method from the associated project type. You can override the default at the project level. If you use capital events to allocate costs, then you can also override the asset cost allocation method at the event level Asset Cost Allocation Methods The following table describes the available asset cost allocation methods.
Method
Basis of Cost Allocation
Actual Units
Number of units defined for each asset
Current Cost
Construction-in-process (CIP) cost of each asset
Estimated Cost
Estimated cost of each asset
Standard Unit Cost
Combination of the standard unit cost and the number of units defined for each asset Spread Evenly Equal allocation of cost to each asset

Reference https://docs.oracle.com/cd/E51367_01/projectop_gs/OAPJC/F1071488AN1004C.htm