Hi Lee, thanks for joining this thread. The CIS feature is working as designed in QuickBooks at the moment, but I understand your need for a more detailed system like the VAT process where you can select a category/account as well as a CIS code. 

QuickBooks Idea Exchange was designed to streamline our feedback process so that we can consolidate requests into one area and ensure we're prioritising what customers want to see the most. We appreciate you sharing your idea with us there, and hope that this can be considered as a development point in the future.