What
higher management review would occur if the corporate function/location is not ISO 9001 registered? By including it at the local level and working with our corporate Sales team, we were able to identify areas to work on at their end, our end and on collaborative issues. They had a copy of our Business Management System manual (even signed off on it) and a posted copy of our ISO 9001 certificate. In fact, as more sites achieved registration, they developed a wall to showcase the certificates, as a means to show the support they provided to the manufacturing locations.
In our case, we had to include Sales because they were the direct line of interaction with the customer. To not include them made proving how we understood and met customer requirements rather difficult.
If the support process you are dealing with does not directly impact the ability to meet customer requirements, then perhaps you do not need to include it in your review. You may wish to contact your Registrar for confirmation on this matter, however.
I would also ask yourself these questions - Is there value to including it in our management review? Does this process add value to our ability to keep our customer happy? Is there any risk to NOT including it in our management review?