The Order Summary object is used to create an invoice. An invoice is a document that requests payment from a customer for an order. An invoice can include one or more fulfillment orders and one or more credit memos. A fulfillment order is a record that represents a part of an order that is fulfilled by a specific location. A credit memo is a record that represents a partial or full refund for an order or a fulfillment order. To create an invoice, an administrator can use the Create Invoice Apex action in a flow. The Create Invoice Apex action requires the Order Summary ID as an input parameter and creates an Invoice record associated with the Order Summary record. Reference: Order Management Objects, [Create Invoice Apex Action]

The type of relationship that exists between FulfillmentOrder and Order Delivery Method is Lookup (Order Delivery Method). A Lookup field is a type of custom field that creates a relationship between two objects, but does not support rollup summary fields. In this case, a FulfillmentOrder has a Lookup field named Order Delivery Method that references an Order Delivery Method record. An Order Delivery Method is a record that represents a delivery option for fulfilling orders, such as standard shipping, express shipping, in-store pickup, etc. An Order Delivery Method can have many FulfillmentOrders associated with it, but a FulfillmentOrder can only have one Order Delivery Method. Verified Reference: https://help.salesforce.com/s/articleView?id=sf.custom_field_types.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.order_management_order_delivery_method.htm&type=5

When a customer applies a discount when placing an order, an order adjustment group summary is created. An order adjustment group summary is a record that represents a modification to the order amount, such as a discount, a surcharge, or a tax. An order adjustment group summary can have one or more order adjustments, which are the individual modifications that are applied to the order or the order items. An order can have one or more order adjustment group summaries, depending on how many types of modifications are applied to the order. Reference: Order Management Objects, [Order Adjustments]

The feature that supports this use case is the Unmanaged Order Checkbox. This is a standard field on the Order Summary object that indicates whether the order is managed by Order Management or not. If this field is checked, then the order is not actioned on by Order Management, and it does not trigger any flows or processes. The administrator can use this field to import Order Summary records containing historical data without affecting the order lifecycle. Verified Reference: https://help.salesforce.com/s/articleView?id=sf.order_management_order_summary.htm&type=5

An administrator would enable Person Accounts during Order Management setup for the use case of connecting Order Management to B2C Commerce. B2C Commerce is a cloud-based platform that enables businesses to create and manage online storefronts for consumers. B2C Commerce uses Person Accounts to represent individual shoppers who place orders on the storefronts. Person Accounts are a type of account that combines account and contact information into a single record. To connect Order Management to B2C Commerce, an administrator needs to enable Person Accounts in Order Management and install the B2C Commerce Integration package from AppExchange. Reference: B2C Commerce Integration, [Person Accounts]