Hi David, few things on this one. First, just wanted to mention that SDM 12.6 is no longer supported as of Dec 2015. The customer really should be planning to upgrade to 14.1 as soon as possible to remain supported and be able to get assistance with any issues as currently we would not really be able to assist much on a 12.6 system without extended support. With that, there are automated ways to import CIs into CMDB using certain CA products. You mentioned that the customer is implementing another tool - do you know what that is? Is it a CA tool that has discovery capability? GRLoader IS manual - you are correct. The reconciliation process happens when CIs are created - CORA checks certain fields to determine if a CI is a duplicate of an existing one or not. But, even when using CA Products, such as IT Asset Manager - it would discover them as "assets" and then they would have to be imported into CMDB using the "pdm_discimp" utility to import discovered assets. So there is some manual parts to it as well, but it could probably be automated using scripts.
There may be other products that can do this automatically - you would want to reach out to your account director here at CA to discuss the different applications and their capabilities.
Hope this helps a bit,
Thanks
Jon I.