Multi-site but separate certifications

I work at a manufacturing company that is headquartered in the USA with a production site in the EU. We are certified to ISO 9001 and the EU facility is certified to ISO 9001 and ISO 14001. EU has their own QMS and separate certification, HOWEVER, many of the core processes are shared and they utlize our ERP, CAR system, etc. Corporate objectives are handed down from US. Design work is primarily handled by us, with some local EU engineering work being done to capture customer requirements, validate product, etc. There are local variations to some processes (some of which we're working to standardize with HQ, some would be wise to leave alone), and of course different regulatory requirements.

Looking for a quick sanity check. Would like to align the systems so that we have one QMS while allowing them to maintain a separate certification as not to put our cert in jeopardy if they blow an audit.

Thanks!

My company has multiple sites globally. There are certain QMS procedures that are standard for all locations but local sites are allowed to have additional local procedures provided that do not conflict with the standard procedures. Many of the sites are on a common certificate, but some sites have their separate certificates. The common certificate does carry some risk unless you have a mature QMS but has worked out very well for us.

Thanks very much for the reply. Definitely thinking about taking that route. How do you identify the interaction of processes? Is it one global process map?

We just reference any processes or procedures that interact within the procedure.