XYZ, LLC doing business as ABC Inc.
Check with the government office where DBA's are filed to see if that's even possible. Many states will not allow a DBA name to include Inc, LLC, LLP, etc. as it is inherently misleading.
The LLC is a new customer. The CIP information is new, but the CDD information you use to predict the future can be derived from prior history. You have no tangible reason to change the risk rating.