How to manage already existing lambda

[njjjjjjjj]

How do I use severless to manage a lambda created somewhere else, say terraform for example. Since the lambda already exists, running serverless deploy will throw an error. Is there anyway to “import” the lambda into serverless CF stack and let serveless manage it? I don’t know if this a common use case but I would like for serveless to just manage the lambda code and not create it