Changing Imagine Airports ADCADS

Have a number of Imagine airports, because a lot of gates have no traffic, as all the gates seem to be "large" but the aprons are full of, mainly, smaller aircraft's I want to allocate some to a gate.The name of the Afcad has been changed in recent years . For example WSSS in now WSSS_ADE9_AMP. I am used to AF2 files.I know when I altered an original file a new afcad was made i.e. AF2_WSSS.Does the ADE9 system work the same. Of course I would back-up the original first.Also do I need to keep the new afcad in the same folder or in the ADDON scenery folder.