preventing a configured item from being created in an org for which the ATO model has already been s

I would like to know how to prevent a configured item from being created in an org for which the ATO model has already been set up.

Just a little background: Last year, we closed one of our plants that we had an org set up for in Oracle. Now, when a configured sales order is created for one of our existing orgs, the configured item continues to get created for the discontinued org, along with all other orgs in which the ATO Model is enabled. How do we prevent these items from being created in the discontinued org but allow them to continue to be created in all the other orgs?