Challenges and Conflict if we are implementing CoreHR after ORC and Learning

Summary:

Please suggest what are the challenges and conflict we face, specially when migrating data from the legacy system if ORC module has gone live recently with minimal required setup in CoreHR and now the company wants to implement full-fledged CoreHR,

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):