SAP Advanced Planner and Optimizer is a legacy planning landscape for demand, supply and detailed scheduling. Migration is not one-to-one: individual APO processes may map to SAP IBP, embedded PP/DS or another target.
IBP and embedded PP/DS cover different planning horizons and functions; target design should be assessed process by process.
A practical SAP APO engagement begins with an inventory of the installed product and release, affected business processes, connected systems and decision-makers. From there, the team can define scope, data and integration requirements, testing responsibilities and a realistic transition or support plan. This is legacy expertise: confirm current SAP maintenance and product availability against your own contract and roadmap.