What is the suggested approach and provisions BRIM offers for brownfield migration i.e., migration of subscription contracts, orders, etc.,
You can check the migration guide available on BRIM portal at
https://help.sap.com/viewer/product/BRIM/1.0/en-US?task=discover_task. Based on your requirement you can check the appropriate one.
- Migration Guide for SAP S/4HANA BRIM Using SAP CRM- Migration Guide for SAP S/4HANA BRIM Using Subscription Order ManagementThanks.Regards