Can we feed supply plan with a Finished good work order to do MRP for raw materials

Summary:

Client is moving to cloud(all modules except manufacturing) from an external system and wants to do only MRP planning for Raw materials in Oracle supply planning Cloud

Manufacturing and Planning(both demand & supply) for Finished Goods will happen in external system

Is it possible to drive the MRP plan(for raw materials) in Oracle Cloud using the planned orders(WO/TO for Finished goods)(from external planning system).If yes, what is the approach. and are there any challenges involved

From Data perspective, we know that we need to load routings, item structures, resources using FBDI so that raw material planning can be done