We use Windows for our servers. We need to move one of our SAP systems from one domain to another domain. We have our main company domain which I will call Domain A. And we have a hosting domain which I will call Domain B. Part of out BASIS team was asked to take a copy of a SAP system that exists in Domain B and build a new system from that copy. They did this but created the system as local aka not in any domain. All of our other SAP systems reside in Domain A and we have worked and struggled with things like optimizer maintenance plans and connectivity until we decided to stop trying to force a squre peg in a round hole. We want to leave the new system where it is but change it to a new domain that our old SAP systems have no problem connecting to.
But we need a game plan. We have a domain controller server up and ready called Domain C. Now what do we do?
Thank you. 
Josie Spencer
SAP BASIS Team Lead