You enable a customer-specific field to be available for UIs and reports relevant for the same business context in the Custom Fields app. The Custom Fields app allows you to create and manage custom fields for business objects in SAP S/4HANA Cloud, public edition. You can define the properties of the custom fields, such as the label, data type, length, and default value. You can also specify the UIs and reports where you want the custom fields to appear, and the business context that determines the visibility and authorization of the custom fields. The Custom Fields app also enables you to activate the custom fields and generate the corresponding CDS views and OData services for consumption by other applications. References = Using the Key-User In- App Extensibility Tools in SAP S/4HANA Cloud Public Edition, Custom Fields and Logic

Fiscal year variant and group currency are activities that are applied to the entire system and cannot be changed after confirmation in SAP Central Business Configuration. These activities are part of the system provisioning step, which is the first step in the implementation process. Once the system provisioning is completed and confirmed, the system is locked for these activities and any changes would require a new system provisioning. Scoping and configuration activities, on the other hand, are not applied to the entire system and can be changed later on in the project experience step, which is the second step in the implementation process. Scoping and configuration activities allow the user to adapt the preconfiguration content to their company's needs and extend the configuration for areas not equipped with preconfiguration content. References = SAP Central Business Configuration - Overview, page 6; Configuring with SAP Central Business Configuration