P3D v4 Load Stock Data but airport code changed

I am editing an afcad for old scenery at an airport that now has a new airport code in the new afcad. I am unable to use the Load Stock Data option in ADE to load in the default objects showing through to remove them. And setting up a large exclusion box is conflicting with the added scenery objects. What can I do? Change the airport code to the old code, load in stock data, remove, then change to new airport code? Another easier way? Thanks very much!
First use old code then load stock data and then remove object then saved it. Start again old code open and then "Raw Data View" to change airport project name and airport ICAO code. Use "save airport as" and complied. Open new code airport then you can all you want edit addon objects etc..