How to Manually Add Source Code to Individual Record?

Hello!

I've created source codes for segments within an extraction set based on the go ahead and am now being asked to add the source code to an individual record for testing purposes.

 

I've added the source code to the hot list for ticketing to make it easy to add, but the point of the source code is that it has been attached to a pricing rule for online discounts.  Is there a way to manually add the source code to an individual record?