This section will demonstrate how to disable the Assign Document ID checkbox for all site collections except your master.
It is important to note that you must make all Document ID prefixes the same on all site collections prior to disabling them.
1.Navigate to site settings on your site, and select Document ID settings, found under site collection administration.
2.On the Document ID Settings page, change the prefix name to one of your choice by typing it into the �Begin IDs with the following characters� section. Do this on all site collections, including the master.
3.You may now deselect �Assign Document ID�s� to disable the assigning of document IDs no this site. Deselect this option for all site collections except your master.