Cost factors are used to identify charges associated with a negotiation line in addition to price, such as shipping and handling, retooling, or import duties. Cost factors are part of the Supplier Negotiation application, which is not required for implementing only the Purchasing application. The other options are all setup components that are needed for the Purchasing application. Reference: Create Cost Factors REST API for Oracle Fusion Cloud Procurement - External Cost Factors and External Cost Factors

To select the attributes to be monitored for a supplier model, you use the Manage Audit Policies task in the Setup and Maintenance work area. Thistask allows you to enable auditing for various business objects, such as suppliers, supplier sites, supplier contacts, and supplier bank accounts. You can also select the attributes of each business object that you want to audit, such as supplier name, address, tax number, and so on. By enabling auditing, you can track the changes made to the supplier model and generate audit reports to protect against fraud. Reference: Overview of Audit Configuration, Section 2.1: “Enable Auditing for Business Objects” Supplier Profile Audit History Setup and Reporting, Section 1: “Supplier Profile Audit History Setup and Reporting” 

To send your purchasing documentsfrom a specific organization-wide email address, you need to use the task Manage Purchasing Profile Options. This task allows you to configure various profile options that control the behavior and functionality of the Purchasing application. One of these profile options is PO: Email Sender Address, which specifies the email address that appears in the From field of the email notifications sent to suppliers and internal users. You can set this profile option at the site level to apply it to all business units, or at the product level to apply it to a specific business unit.

Reference: Implement Procurement - docs.oracle.com

PRC:PO: Supplier Communication from Email Address … - My Oracle Support

PRC:PO: Sending Purchase Order (PO) Email … - My Oracle Support

When you create an implementation project, you can select the offerings and functional areas that you want to implement by selecting the Enable check box for each option. This will generate a list of  setup tasks for the selected options. You can also see the status of each offering and functional area, such as Provisioned, Enabled, or Not Enabled. After creating the implementation project, you can update the status of each task to indicate the progress of the implementation. You can set the status to In Progress, Implemented, or Not Applicable. This will help you to identify the stage of each offering and functional area in the implementation project. Reference: How You Use Implementation Projectsto Manage Setup

Oracle Fusion Applications Procurement Implementation Guide, Section 2.1: “Create Implementation Project”

To set up a Procurement business unit to serve the procurement needs of various Requisitioning business units, you must set up a Service Provider relationship in the Requisitioning business unit setup. This relationship defines the Procurement business unit as the service provider of the procurement business function, and the Requisitioning business units as its clients. This way, the Procurement business unit can take care of supplier negotiations, supplier site maintenance, and purchase order processing on behalf of the Requisitioning business units. The other options are not relevant for this requirement. Reference: 1: Service Provider Models - Oracle 2: Implement Procurement - docs.oracle.com [3]: Setup Stepsin Oracle Fusion Cloud Procurement