How do I split single item to do FBA and FBM?

Hello… I want to try out one of my single item to do FBA and FBM. I’m already doing FBA. For example, I’m doing 49 units FBA and I want to try 1 unit FBM. Can I split 1 unit to FBM? Can someone please walk me through the process? I already bought one and sent to my home to try out FBM shipment if it’s worth doing it or not. Thank you