Add Field to Customer > Demand > Part

We have created a UD field for parts we do not want to sell via EDI. We have a BPM on order entry to stop those parts however, EDI orders do not hit that BPM. What I am trying to accomplish is if these particular Part#'s/UPC’s come in via EDI that it is stopped in the workbench. If you look at Customer Maintenance > Demand > Part --There are fields for Check for Part - Action, Check for Revision - Action, and Check for Run Out Part - action. I would like to see if I can add another Check for X - Action.
We use Epicor Demand Entry and Demand Workbench to check EDI Orders.
Any help would be appreciated.